Prevalence and correlates of mental retardation among children in Karachi, Pakistan

Inositol monophosphatase 1 (IMPA1) mutation in intellectual disability patients impairs neurogenesis but not gliogenesis

A homozygous mutation in the inositol monophosphatase 1 (IMPA1) gene was recently identified in nine individuals with severe intellectual disability (ID) and disruptive behavior. These individuals belong to the same family from Northeastern Brazil, which has 28 consanguineous marriages and 59 genotyped family members. IMPA1 is responsible for the generation of free inositol from de novo biosynthesis and recycling from inositol polyphosphates and participates in the phosphatidylinositol signaling pathway. To understand the role of IMPA1 deficiency in ID, we generated induced pluripotent stem cells (iPSCs) from patients and neurotypical controls and differentiated these into hippocampal dentate gyrus-like neurons and astrocytes. IMPA1-deficient neuronal progenitor cells (NPCs) revealed substantial deficits in proliferation and neurogenic potential. At low passage NPCs (P1 to P3), we observed cell cycle arrest, apoptosis, progressive change to a glial morphology and reduction in neuronal differentiation. These observations were validated by rescuing the phenotype with myo-inositol supplemented media during differentiation of patient-derived iPSCs into neurons and by the reduction of neurogenic potential in control NPCs-expressing shIMPA1. Transcriptome analysis showed that NPCs and neurons derived from ID patients have extensive deregulation of gene expression affecting pathways necessary for neurogenesis and upregulation of gliogenic genes. IMPA1 deficiency did not affect cell cycle progression or survival in iPSCs and glial progenitor cells or astrocyte differentiation. Therefore, this study shows that the IMPA1 mutation specifically affects NPC survival and neuronal differentiation.

Validity and reliability of the Neurodevelopmental Screening Tool (NDST) in screening for neurodevelopmental disorders in children living in rural Kenyan coast

Background: There are no data on the precise burden of neurodevelopmental disorders (NDD) in Africa, despite high incidence of risk factors. Ten Questions Questionnaire (TQQ) has been used extensively in Africa to screen neurological impairments but not autism spectrum disorders (ASD) and attention-deficit hyperactivity disorders (ADHD). The Neurodevelopmental Screening Tool (NDST) has reliably assessed NDD in Asia; its validity in Africa is unknown. Methods: Using NDST and TQQ, we screened 11,223 children aged 6-9 years in Kilifi, Kenya. We invited all screen-positives and a proportion of screen-negative children for confirmatory diagnosis of NDD using clinical history, neuropsychological assessments and interviews. Results: In total, 2,245 (20%) children screened positive for NDD. Confirmatory testing was completed for 1,564 (69.7%) screen-positive and 598 (6.7%) screen-negative children. NDST's sensitivity was 87.8% (95%CI: 88.3-88.5%) for any NDD, 96.5% (95%CI:96.1-96.8%) ASD and 89.2% (95%CI: 88.7-89.8%) for ADHD. Moderate/severe neurological impairments' sensitivities ranged from 85.7% (95%CI: 85.1-86.3%) for hearing impairments to 100.00% (100.0-100.0%) for motor impairments. NDST had higher sensitivities than TQQ for epilepsy (88.8 vs 86.7), motor impairments (100.0 vs 93.7) and cognitive impairment (88.2 vs 84.3). Sensitivities for visual and hearing impairments were comparable in both tools. NDST specificity was 82.8% (95%CI: 82.1-83.5%) for any NDD, 94.5% (95%CI: 94.0-94.9%) for ASD and 81.7% (95%CI: 81.0-82.4%) for ADHD. The specificities range for neurological impairments was 80.0% (95%CI: 79.3-80.7%) for visual impairments to 93.8% (95%CI: 93.4-94.3%) for epilepsy. Negative predictive values were generally very high (≤100%), but most positive predictive values (PPV) were low (≤17.8%). Domain specific internal consistency ranged from 0.72 (95%CI: 0.70-0.74) for ADHD to 0.89 (95%CI: 0.87-0.90) for epilepsy. Conclusions: NDST possesses high sensitivity and specificity for detecting different domains of NDD in Kilifi. Low PPV suggest that positive diagnoses should be confirmed when samples are drawn from a population with low disease prevalence.

Long-term neurocognitive and educational outcomes of neonatal insults in Kilifi, Kenya

BACKGROUND

There is little data on the long-term neurocognitive and educational outcomes among school-aged survivors of neonatal jaundice (NNJ) and hypoxic-ischemic encephalopathy (HIE) in Africa. This study investigates the long-term neurocognitive and educational outcomes and the correlates of these outcomes in school-aged survivors of NNJ or HIE in Kilifi, Kenya.

METHODS

We conducted a cross-sectional study on neurocognitive and educational outcomes among school-aged survivors (6-12 years) of NNJ (n = 134) and HIE (n = 107) and compared them to a community comparison group (n = 134). We assessed nonverbal intelligence, planning, working memory, attention, syntax, pragmatics, word-finding, memory, perceptual-motor, mathematical, and reading abilities. We also collected information on medical history, caregivers' mental health, and family environment.

RESULTS

The survivors of NNJ had lower mean total scores in word-finding [F (1, 250) = 3.89, p = 0.050] and memory [F (1, 248) = 6.74, p = 0.010] than the comparison group. The survivors of HIE had lower mean scores in pragmatics [F (1, 230) = 6.61, p = 0.011] and higher scores higher scores in non-verbal reasoning [F (1, 225) =4.10, p = 0.044] than the comparison group. Stunted growth was associated with almost all the outcomes in HIE.

CONCLUSION

Survivors of NNJ and HIE present with impairment in the multiple domains, which need to be taken into consideration in the planning of educational and rehabilitative services.

Cancer treatment in disabled children

The incidence of cancer in children with intellectual disability has been poorly documented. We report our experience of treating children and adolescents with cancer and intellectual disability (40 patients), from 2004 to 2018. A treatment-sparing approach was adopted for 6 patients with severe intellectual impairment to minimize toxicity: a child with postpartum asphyxia and medulloblastoma did not receive radiotherapy; 1 patient with mitochondrial encephalopathy and a testicular germ cell tumor did not receive bleomycin and lung metastasectomy; 2 patients (1 with Down + West syndrome + Wilms tumor (WT) and 1 with Denys-Drash syndrome + WT) did not receive vincristine; 1 child with corpus callosum agenesis and anaplastic ependymoma did not receive chemotherapy; 1 child with structural chromosomal aberrations and a primitive neuro-ectodermal tumor received personalized chemotherapy. Heminephrectomy was performed in 4 patients with WT to preserve their kidney function. We found no statistically significant correlation between relapse or mortality rates and the use of a treatment-sparing approach. The 5-year overall survival (OS) and event-free survival (EFS) rates were 84.5% and 66.1% as opposed to 82.5% and 46.9%, respectively, for patients in our usual-treatment and treatment-sparing groups.Conclusion: We only opted for a treatment-sparing approach for patients with severe disabilities, and their OS was in line with that of children without intellectual disability. What is Known: • There are few reports on children/adolescents with cancer and intellectual disability (ID). • It is not clear how to manage them and whether a treatment sparing should be considered, especially in the case of severe disability. What is New: • Most patients received the standard cancer treatment and only in the case of severe disability, a therapeutic saving approach was applied. • No statistically significant correlations between relapse/mortality rates and the use of a treatment-sparing approach were found.

Homozygous variants in the HEXB and MBOAT7 genes underlie neurological diseases in consanguineous families

BACKGROUND

Neurological disorders are a common cause of morbidity and mortality within Pakistani populations. It is one of the most important challenges in healthcare, with significant life-long socio-economic burden.

METHODS

We investigated the cause of disease in three Pakistani families in individuals with unexplained autosomal recessive neurological conditions, using both genome-wide SNP mapping and whole exome sequencing (WES) of affected individuals.

RESULTS

We identified a homozygous splice site variant (NM_000521:c.445 + 1G > T) in the hexosaminidase B (HEXB) gene confirming a diagnosis of Sandhoff disease (SD; type II GM2-gangliosidosis), an autosomal recessive lysosomal storage disorder caused by deficiency of hexosaminidases in a single family. In two further unrelated families, we identified a homozygous frameshift variant (NM_024298.3:c.758_778del; p.Glu253_Ala259del) in membrane-bound O-acyltransferase family member 7 (MBOAT7) as the likely cause of disease. MBOAT7 gene variants have recently been identified as a cause of intellectual disability (ID), seizures and autistic features.

CONCLUSIONS

We identified two metabolic disorders of lipid biosynthesis within three Pakistani families presenting with undiagnosed neurodevelopmental conditions. These findings enabled an accurate neurological disease diagnosis to be provided for these families, facilitating disease management and genetic counselling within this population. This study consolidates variation within MBOAT7 as a cause of neurodevelopmental disorder, broadens knowledge of the clinical outcomes associated with MBOAT7-related disorder, and confirms the likely presence of a regionally prevalent founder variant (c.758_778del; p.Glu253_Ala259del) in Pakistan.

Genetics of intellectual disability in consanguineous families

Autosomal recessive (AR) gene defects are the leading genetic cause of intellectual disability (ID) in countries with frequent parental consanguinity, which account for about 1/7th of the world population. Yet, compared to autosomal dominant de novo mutations, which are the predominant cause of ID in Western countries, the identification of AR-ID genes has lagged behind. Here, we report on whole exome and whole genome sequencing in 404 consanguineous predominantly Iranian families with two or more affected offspring. In 219 of these, we found likely causative variants, involving 77 known and 77 novel AR-ID (candidate) genes, 21 X-linked genes, as well as 9 genes previously implicated in diseases other than ID. This study, the largest of its kind published to date, illustrates that high-throughput DNA sequencing in consanguineous families is a superior strategy for elucidating the thousands of hitherto unknown gene defects underlying AR-ID, and it sheds light on their prevalence.

Genetics of autosomal recessive intellectual disability

In the last few years, next-generation sequencing has led to enormous progress in deciphering monogenic forms of intellectual disability. Autosomal dominant intellectual disability (ADID) and X chromosomal intellectual disability (XLID) have been the focus of research. Apart from metabolic disorders, autosomal recessive intellectual disability (ARID) is still behind, probably because it is more heterogeneous and less prevalent in industrial populations. The prevalence of ARID in a cohort of affected children of an outbred population is estimated to be about 10%, with an upward tendency in still unclarified cases. The risk for ARID in children of first cousins or closer is a magnitude higher than for children of unrelated parents. Taken together, it seems that children of related parents are at a 2 to 3 times higher risk for ID. There are no prevalent ARID genes, pathways, or protein complexes and the functions of the affected proteins are very diverse and limited not only to neurological aspects. Thus, in a regular case, there is no reasoning for picking a few genes for a first diagnostic step, and a genetic diagnosis of ID in general, and ARID specifically, is better made using large panels or exome sequencing. In addition, in the last few months, evidence has been growing that many ARID genes are pleiotropic and that the resulting phenotypes may have a broad spectrum. For an exhaustive deciphering of the genetics of ARID, we suggest research at the level of single genes rather than large meta-analyses.

Socioeconomic Status and Pediatric Neurologic Disorders: Current Evidence

Socioeconomic status (SES) is an important risk factor for many neurological disorders and a determinant of health outcomes and quality of life, especially for individuals with neurologic disorders and developmental disabilities. This article focuses on the relationship between SES and pediatric epilepsy, cerebral palsy, autism spectrum disorder, and intellectual disability. Disparities in the prevalence and long-term impact of SES on functioning in persons with disabilities are observed worldwide. Clinicians can use the information presented in the article to target early identification and interventions for improving outcomes in populations most at risk for these disorders and for poor health, social, and economic outcomes.

The association between malnutrition and childhood disability in low- and middle- income countries: systematic review and meta-analysis of observational studies

OBJECTIVE

The aim of this study was to evaluate the association between childhood disability and malnutrition in low- and middle- income countries (LMICs).

METHODS

Articles were identified from 1990 to August 2017 by searching nine electronic databases. Epidemiological studies, undertaken in LMICs that compared the prevalence of malnutrition in children with disabilities to children without disabilities were eligible for inclusion. Titles, abstracts, and full texts were screened by two reviewers, and data were extracted using a structured table for eligible papers. Meta-analyses for the association between childhood disability and undernutrition were performed.

RESULTS

The search generated 4678 results, from which 17 articles were eligible. Fifty-three per cent of these studies showed a positive association between childhood disability and undernutrition. Results varied when disaggregated by type of disability, with positive associations identified for 44% of studies focussed on neurodevelopmental disability, 60% of general disability studies and 67% of studies on hearing impairment. Only four studies were identified that considered overnutrition outcomes, and these showed variable results. Eighteen per cent of eligible studies were considered at low risk of bias, 53% had a medium risk, and 29% had a high risk of bias. Pooled ORs showed that children with disabilities were almost three times more likely to be underweight (OR 2.97, 95% CI 2.33, 3.79), and nearly twice as likely to experience stunting and wasting (Stunting: 1.82, 1.40, 2.36; Wasting: 1.90, 1.32-2.75), compared to controls.

CONCLUSIONS

Children with disabilities may be a vulnerable group for undernutrition in LMICs, which should be reflected in disability and nutritional programming and policy-making.

The Use of Next-Generation Sequencing for Research and Diagnostics for Intellectual Disability

Genetic or genomic mutation is a major cause of intellectual disability (ID). However, despite the generally anticipated strong genotype/phenotype correlation for ID, there are huge obstacles to gene identification, except perhaps where very distinct syndromic features are observed, because of the high degree of genetic heterogeneity and wide variability of phenotype for different mutations or even with the same mutation within a single gene. A recent review estimates in excess of 2500 genes for ID. Fortunately for researchers and diagnosticians alike, the recent advent of massively parallel sequencing technologies, or next-generation sequencing (NGS) has made an apparently impossible task tractable. Here, we review the ongoing research endeavors to identify new disease genes, as well as strategies and approaches at the clinical level.

Malnutrition as a cause of mental retardation: A population-based study from Sub-Himalayan India

Background:

Mental retardation is one of the most common disabilities of childhood. The research on childhood malnutrition and its relationship with cognitive functioning suggests that malnutrition alone does not cause mental retardation.

Objective:

To identify the relation between malnutrition and cognition among children from a Sub-Himalayan state in North India.

Materials and Methods:

A two-phase cross-sectional study was conducted in the rural, urban, and slum area of district Kangra. A 30-cluster sampling technique was used to screen a population of children 1–10 years of age from five randomly selected panchayats (village government units) of district Kangra. The screening was based on a modified version of the ten questions screen, adapted to the local population. In the first phase, a door-to-door survey was done to identify suspects of mental retardation. In the second phase, the children found positive in the first phase were called for clinical examination to confirm mental retardation. Anthropometric assessment of all study children was done by measuring weight and height. The nutritional assessment was done by categorizing them according to Waterlow classification for malnutrition.

Results:

Out of the total 5300 children, 1.7% were diagnosed as mentally retarded. No positive association was reported with different types of malnutrition and mental retardation. A weakly positive association existed between nutritional status and mental retardation (correlation coefficient-0.04). Children who were both wasted and stunted had the highest risk (odds ratio, 95% confidence interval – 5.57, 2.29–10.36) of mental retardation as compared to normal.

Conclusion:

Malnutrition may be one of the causes but certainly not the only cause of mental retardation. Other causes may be contributing more significantly toward it.

Frequency of ICD-10 psychiatric diagnosis in children with intellectual disability in Lahore, Pakistan & Caregivers Perspective

Objective:

Association between Intellectual disability (ID) and psychiatric disorders in children & adolescents is well established but there is a paucity of published studies from Pakistan on this topic. The main aim of the study was to assess the frequency of ICD-10 psychiatric diagnosis in the hospital outpatient sample of children with ID in Lahore, Pakistan as well as to find out which challenging behaviors, caregivers find difficult to manage in this setup.

Methods:

Socio-demographic information was collected, Wechsler Intelligence Scale for Children-Revised & ICD-10 diagnostic criteria was used to assess children (age range 6 – 16 years) with suspected ID along with identification of behaviors found to be difficult to manage by caregivers.

Results:

150 children were assessed with mean age of 10.7 years (males 70 %). Majority (72%) had mild ID while 18.7% and 9.3% had moderate and severe ID respectively. Thirty percent of children met the criteria for any psychiatric diagnosis, the most common being Oppositional Defiant Disorder (14%) and Hyperkinetic Disorders (10%). Verbal and physical aggression, school difficulties, socialization problems, inappropriate behaviors (e.g. disinhibition), sleep & feeding difficulties were the significant areas identified by the caregivers as a cause of major concern.

Conclusions:

Significantly high prevalence of ICD-10 psychiatric diagnosis in children with ID was found in Lahore, Pakistan. Support services for these children should be responsive not only to the needs of the child, but also to the needs of the family.

Socio demography of mental retardation: A community-based study from a goitre zone in rural sub-Himalayan India

INTRODUCTION

Mental retardation is one of the most common disabilities of childhood which can be prevented by timely identification of the causative agent and an adequate management accordingly. District Kangra lies in the sub-Himalayan belt and forms a part of the 2400 km long goitre belt along the southern slopes of the Himalayas.

OBJECTIVE

To study the prevalence of mental retardation among children (1-10) years of age.

MATERIALS AND METHODS

A two-phase cross-sectional study was conducted in the rural area of district Kangra. A 30-cluster sampling technique was used to screen a population of children 1-10 years of age from five randomly selected panchayats (village government units) of district Kangra. The screening was based on a modified version of the ten questions screen, adapted to the local population. In the first phase a door to door survey was done to identify suspects of mental retardation. In the second phase, the children found positive in the first phase were called for examination by the pediatrician to confirm mental retardation.

RESULTS

A total of 2420 children were screened in the first phase of which 95 tested positive. About 52 of these children were found to be mentally retarded in the second phase giving a prevalence of 2.15%. The 69% of these children belonged to the lower middle class and 28.3% belonged to middle class families using the Uday Parekh scale for assessment of the socio-economic status.

CONCLUSION

Prevalence of mental retardation is high in district Kangra of Himachal Pradesh in comparison to other states of India. This could be attributed to the good primary health care in Himachal Pradesh where institutional deliveries are about 70%. This may have led to better survival of children with congenital disorders and those that suffer perinatal trauma.

Molecular diagnosis of Fragile X syndrome in subjects with intellectual disability of unknown origin: implications of its prevalence in regional Pakistan

Fragile-X syndrome (FXS) is the most common form of inherited intellectual disability (ID) and affects 0.7–3.0% of intellectually compromised population of unknown etiology worldwide. It is mostly caused by repeat expansion mutations in the FMR1 at chromosome Xq27.3. The present study aimed to develop molecular diagnostic tools for a better detection of FXS, to assess implementation of diagnostic protocols in a developing country and to estimate the prevalence of FXS in a cohort of intellectually disabled subjects from Pakistan. From a large pool of individuals with below normal IQ range, 395 subjects with intellectual disability of unknown etiology belonging to different regions of the country were recruited. Conventional-PCR, modified-PCR and Southern blot analysis methods were employed for the detection of CGG repeat polymorphisms in the FMR1 gene. Initial screening with conventional-PCR identified 13 suspected patients. Subsequent investigations through modified PCR and Southern blot analyses confirmed the presence of the FMR1 mutation, suggesting a prevalence of 3.5% and 2.8% (mean 3.3%) among the male and female ID patients, respectively. These diagnostic methods were further customized with the in-house conditions to offer robust screening of referral patients/families for diagnostics and genetic counseling. Prescreening and early diagnosis are crucial for designing a prudent strategy for the management of subjects with ID. Outcome of the study recommends health practitioners for implementation of molecular based FXS diagnosis in routine clinical practice to give a better care for patients similar to the ones included in the study.

Family networks to improve outcomes in children with intellectual and developmental disorders: a qualitative study

Background

There are at least 50 million children with an intellectual or developmental disorder in South Asia. The vast majority of these children have no access to any service and there are no resources to develop such services. We aimed to explore a model of care-delivery for such children, whereby volunteer family members of affected individuals could be organized and trained to form an active, empowered group within the community that, a) using a task-sharing approach, are trained by specialists to provide evidence-based interventions to their children; b) support each other, with the more experienced FaNs i.e. family networks, providing peer-supervision and training to new family members who join the group; and c) works to reduce the stigma associated with the condition.

Methods

We used qualitative methods to explore carers’ perspectives about such a care-delivery model.

Results

The key findings of this research are that there is a huge gap between the needs of the carers and available services. Carers would welcome a volunteer-led service, and some community members would have time to volunteer. Raising community awareness in a culturally sensitive manner prior to launching such a service and linking it to the community health workers programme would increase the likelihood of success. Gender-matching would be important. It would be possible to form family networks around the more motivated volunteers, with support from local non-governmental organizations. The carers were receptive to the use of technology to assist the work of the volunteers as well as for networking.

Conclusions

We conclude that family volunteers delivering evidence-based packages of care after appropriate training is a feasible system that can help reduce the treatment gap for childhood intellectual and developmental disorders in under-served populations.

Frequency of FMR1 gene mutation and CGG repeat polymorphism in intellectually disabled children in Pakistan

Fragile X syndrome is considered the most common heritable form of X-linked intellectual disability (ID). The syndrome is caused by silencing of the fragile X mental retardation 1 gene (Xq27.3) due to hypermethylation. This mutation results in absence or deficit of its protein product, the fragile X mental retardation protein (FMRP) that affects synaptic plasticity in neurons, hence leads to brain dysfunction. The syndrome is widely distributed throughout the world. This study reported for the first time the frequency of the fragile X mental retardation 1 gene mutations in intellectually disabled children in Pakistan. We recruited 333 intellectually disabled children and 250 normal children with age ranging from 5 to 18 years for this study. Genomic DNA was extracted from peripheral blood and full mutations were identified by methylation sensitive PCR using primers corresponding to modified methylated and unmethylated DNA. Southern blot was used for confirmation of the results. The frequency of fragile X syndrome with full mutation was found as 4.8%. It was 6.5% in males as opposed to 0.9% in females; 29 CGG repeats were found as the most common allele; 31.5% in the intellectually disabled and 34% in control subjects. In Pakistan intellectual disability is considered as a social stigma for the individuals and their families. Due to lack of knowledge and cultural background people make such patients and families isolated. This study will increase public awareness about the intellectual disability and importance of prenatal screening and genetic counseling for vulnerable families.

Validation of a home-based neurodevelopmental screening tool for under 2-year-old children in Bangladesh

BACKGROUND

Home-based screening to identify young children at risk for neurodevelopmental impairments (NDIs) is needed to guide the targeting of child neurodevelopmental intervention services in Bangladesh. This study aimed to validate such a tool for children under age 2 years.

METHODS

A Developmental Screening Questionnaire was administered to mothers of children aged 0-<2 years in an urban community. Inter-rater reliability among the interviewers, who were high school graduates, was determined. All children who were screen positive and a proportion of screen negatives were subsequently assessed for NDIs by professionals. Sensitivity and specificity were calculated by comparing screening with assessment results.

RESULTS

Mean kappa coefficient of agreement among interviewers was 0.95. A total of 197 children were screened, of whom 17% screened positive. Fifty-one children, including 24 screen negatives, were assessed for NDIs. Screen-positivity was significantly different between income groups (P = 0.019), and higher in stunted children (odds ratio = 5.76, 95% confidence interval = 1.72-19.28), indicating good discriminant validity Specificity was excellent (84-100%) for all developmental domains. Sensitivity was 100% for vision and hearing; 70% for speech; and 63%, 53%, 48%, and 45% for gross motor, behaviour, fine motor and cognitive impairments, respectively.

CONCLUSION

A tool for screening <2-year-old children at risk for NDIs showed high specificity; and was able to identify all children at risk for vision and hearing impairments, nearly three-fourths with speech impairments, two-thirds with gross motor impairments, and about half with behavioural, cognitive and fine motor impairments. The Developmental Screening Questionnaire tool has potential for use by frontline workers to screen large populations and to link to definitive assessment as well as intervention services.

The prevalence of disorders causing disability in young adult males in Turkey between 2009-2011

OBJECTIVE

Disability is one of the significant problems that the public faces as regards social aspects, economics, public health and politics. Our aim was to review the prevalence of diseases causing disabilities in young adult men who are declared "unfit for military service" in Turkey after medical examination.

METHODS

We reviewed the prevalence of diseases among 113,175 young adult men who were referred for medical examination between 2009 and 2011.

RESULTS

Prevalence of unfitness for military service was 5.56% in 2009, 6.74% in 2010 and 6.77% in 2011. Leading causes for young adult men to be rejected from military service was intellectual disability 6.88, hearing loss 3.71, epilepsy 1.59, schizophrenia 1.54 and diabetes mellitus 1.47 per thousand people.

CONCLUSION

Screening for the prevalence of disability conditions is an important data source for policies to be developed. Supporting such survey with community based studies in different populations in future shall be beneficial for improvement of policies in social and health fields.

Burden of surgical congenital anomalies in Kenya: a population-based study

BACKGROUND

Congenital malformations are a significant component of the global burden of disease among children, accounting for 25 million disability-adjusted life years (DALYs) worldwide. Unfortunately, efforts to estimate the burden of pediatric surgical disease in Africa are limited by the absence of population-based data. The objective of this study was to estimate both the prevalence and the disease burden of several common congenital surgical malformations among children in Kenya.

METHODS

Community volunteers randomly surveyed households at sites across Kenya. Caretakers were asked to identify on a photographic portfolio, several congenital malformations present among the children in their household, including club foot, hypospadias, hydrocephalus, spina bifida/encephalocele, cleft lip, bladder exstrophy and imperforate anus. DALYs were then calculated based on life expectancy tables and published and estimated disability weights for the conditions encountered.

RESULTS

The caregivers of 5559 children (54% female) were surveyed in 1909 households, 56% of which were rural, 31% suburban and 12% urban. The overall prevalence of congenital malformations was 6.3 per 1000 children, amounting to 54-120 DALYs per 1000 children, depending on the life tables used. The most prevalent condition in the survey was club foot, whereas spina bifida had the highest burden of disease.

DISCUSSION

This study is the first to document the prevalence of selected surgical congenital malformations among children in Kenya and the burden of disease associated with them. The results will serve to inform strategies aimed at reducing the unmet burden of surgical disease in resource-limited regions.

Familial mental retardation: a review and practical classification

Mental retardation (MR) is a definition which comprises a series of conditions whose common feature is an intellectual handicap that develops before the age of 18, afflicting 2-3% of the world's population. The classification of MR into different categories is determined by the extent of the handicap instead of its cause, which often remains unrecognized. Sometimes, MR runs in a family, characterizing familial MR, and those cases permit an in-depth look into the genetic causes and consequences of the problem. However, almost no work is available on the prevalence of familial MR among the registered MR cases, possibly because familial MR is a term with no clear definition. The scope of this work is to review the topic and discuss the implications of different genetic and environmental factors, which characterize particular categories of familial cases, suggesting a practical classification of familial MR, which is important for epidemiologic studies and also for counseling in the clinic. Some of the aspects are discussed under the perspective of a newly-developed country like Brazil.

Prevalence of early childhood disability in a rural district of Sind, Pakistan

AIM

Children born in low- and mid-income countries are at a high risk of developing disabilities, yet estimates of population-based prevalence are sparse. Our aim was to determine the prevalence of early childhood (0-5 year) disability in Sind, a rural area of Pakistan.

METHOD

We conducted a cross-sectional household survey in a population of 25,196 households. The Ten Questions screen and the Signs of Disability in Newborn and Infants screen were used.

RESULTS

The disability prevalence in a population of 176,364 individuals was 5.5 out of 1000 in children under 2 years and 5.4 out of 1000 in children aged 2-5 years. Fifty-six per cent were males, and 56% had the disability recognized from birth or soon after. The mortality rate of children aged 0-5 years in the area was estimated as 30 out of 1000 live births. Cerebral palsy was the most common disability identified. The Ten Questions screen had better interrater agreement than the Signs of Disability in Newborn and Infants screen.

INTERPRETATION

This is the largest reported household screening survey for early childhood disability at a population level from rural Pakistan. The comparatively low prevalence may be due to the younger age studied and high early childhood mortality. Our data highlight the importance of prospective surveillance at a population level and the need for preventive and support services.

Prevalence and risk factors for neurological disorders in children aged 6 months to 2 years in northern India

AIM

To study prevalence and risk factors for neurological disorders--epilepsy, global developmental delay, and motor, vision, and hearing defects--in children aged 6 months to 2 years in northern India.

METHOD

A two-stage community survey for neurological disorders was conducted in rural and urban areas of Lucknow. After initial screening with a new instrument, the Lucknow Neurodevelopment Screen, screen positives and a random proportion of screen negatives were validated using predefined criteria. Prevalence was calculated by weighted estimates. Demographic, socio-economic, and medical risk factors were compared between validated children who were positive and negative for neurological disorders by univariate and logistic regression analysis.

RESULTS

Of 4801 children screened (mean age [SD] 15.32mo [5.96]; 2542 males, 2259 females), 196 were positive; 190 screen positives and 269 screen negatives were validated. Prevalence of neurological disorders was 27.92 per 1000 (weighted 95% confidence interval 12.24-43.60). Significant risk factors (p≤0.01) for neurological disorders were higher age in months (p=0.010), lower mean number of appliances in the household (p=0.001), consanguineous marriage of parents (p=0.010), family history of neurological disorder (p=0.001), and infants born exceptionally small (parental description; p=0.009). On logistic regression, the final model included age (p=0.0193), number of appliances (p=0.0161), delayed cry at birth (p=0.0270), postneonatal meningoencephalitis (p=0.0549), and consanguinity (p=0.0801).

INTERPRETATION

Perinatal factors, lower socio-economic status, and consanguinity emerged as predictors of neurological disorders. These factors are largely modifiable.

Brain magnetic resonance imaging findings in patients with mucopolysaccharidosis VI

INTRODUCTION

Mucopolysaccharidosis type VI (MPS VI) is a rare lysosomal storage disorder caused by the deficient activity of N-acetylgalactosamine 4-sulfatase. MPS VI is usually considered as not being associated with mental retardation.

AIMS/METHODS

The main objective of the present study was to describe brain magnetic resonance imaging (MRI) findings and their correlation with clinical and biochemical findings in MPS VI patients. The study was conducted at Hospital de Clínicas de Porto Alegre, Brazil with 25 MPS VI patients. All patients were evaluated through clinical evaluation, IQ tests, urinary glycosaminoglycans (GAG) analysis, and brain MRI.

RESULTS

Mean age at evaluation was 10.6 ± 4.52 years. Five of 16 patients presented total IQ below the normal range. Brain MRI was abnormal in the majority of patients (n = 19/21), and the most frequent abnormalities found were the presence of dilated perivascular spaces and white matter lesions. Correlations were found between age and normalized white matter lesion load (NLL) (r = 0.46; p = 0.04) and normalized cerebral volume (NCV) (r = -0.56; p = 0.01), between NLL and height deficit (r = 0.48; p = 0.04), and between NCV and weight deficit (r = -0.58; p = 0.01) and height deficit (r = -0.55; p = 0.01). A correlation between urinary GAG levels and quantitative brain MRI findings was not found, neither between qualitative and quantitative brain MRI findings and IQ scores.

CONCLUSIONS

MPS VI patients may present abnormal IQ scores without correlation with brain abnormalities on the MRI, a finding which was found to be very frequent in MPS VI. Additional studies are required to confirm our findings.

Attitudes of Pakistani community members and staff toward people with intellectual disability

The acceptance and inclusion of persons with intellectual disability can vary across cultures, and understanding attitudes can provide insight into such variation. To our knowledge, no previous study has explored attitudes toward people with intellectual disability among Pakistani community members and disability service providers. We administered the Community Living Attitudes Scale (Henry et al., 1996), a measure of attitudes toward people with intellectual disability developed in the United States, to 262 community members and 190 disability service providers in Pakistan. Confirmatory factor analysis found a 4-factor solution (empowerment, similarity, exclusion, and sheltering) fit the Pakistani sample. More positive attitudes were observed in staff serving people with intellectual disability, females, Christians, Hindus, Sunnis, and people with greater education. We discuss implications for research, theory, and practice.

"Communities" in community engagement: lessons learned from autism research in South Korea and South Africa

Little research has been conducted on behavioral characteristics of children with autism spectrum disorder (ASD) from diverse cultures within the US, or from countries outside of the US or Europe, with little reliable information yet reported from developing countries. We describe the process used to engage diverse communities in ASD research in two community-based research projects-an epidemiologic investigation of 7- to 12-year olds in South Korea and the Early Autism Project, an ASD detection program for 18- to 36-month-old Zulu-speaking children in South Africa. Despite the differences in wealth between these communities, ASD is underdiagnosed in both settings, and generally not reported in clinical or educational records. Moreover, in both countries, there is low availability of services. In both cases, local knowledge helped researchers to address both ethnographic as well as practical problems. Researchers identified the ways in which these communities generate and negotiate the cultural meanings of developmental disorders. Researchers incorporated that knowledge, as they engaged communities in a research protocol, adapted and translated screening and diagnostic tools, and developed methods for screening, evaluating, and diagnosing children with ASD.

Prevalence of mental retardation among children in RS Pura town of Jammu and Kashmir

OBJECTIVE

To determine the Prevalence of mental retardation in children 3 to 10 years of age.

MATERIALS AND METHODS

The study was conducted in the framework of a population based, single centre, cross-sectional study at R.S.Pura town, 22 kms south- west of Jammu city.

RESULTS

A total of 61 (0.79 percent) of the 7,707 children surveyed had positive screening results on the Ten Questions instrument. 56 (0.72percent) children were diagnosed as suffering from mental retardation. Serious mental retardation was diagnosed in 48 children and mild mental retardation was diagnosed in 8 children. The combined prevalence estimates of mild and serious mental retardation were 7.2/1000. No notable sex differences were observed for either serious or mild retardation.

INTERPRETATION

The prevalence rates of mental retardation among children less than 19 years of age in R. S. town compares favorably with studies from developed world.

Childhood disability and socio-economic circumstances in low and middle income countries: systematic review

BACKGROUND

The majority of children with disability live in low and middle income (LAMI) countries. Although a number of important reviews of childhood disability in LAMI countries have been published, these have not, to our knowledge, addressed the association between childhood disability and the home socio-economic circumstances (SEC). The objective of this study is to establish the current state of knowledge on the SECs of children with disability and their households in LAMI countries through a systematic review and quality assessment of existing research.

METHODS

Electronic databases (MEDLINE; EMBASE; PUBMED; Web of Knowledge; PsycInfo; ASSIA; Virtual Health Library; POPLINE; Google scholar) were searched using terms specific to childhood disability and SECs in LAMI countries. Publications from organisations including the World Bank, UNICEF, International Monetary Fund were searched for. Primary studies and reviews from 1990 onwards were included. Studies were assessed for inclusion, categorisation and quality by 2 researchers.

RESULTS

24 primary studies and 13 reviews were identified. Evidence from the available literature on the association between childhood disability and SECs was inconsistent and inconclusive. Potential mechanisms by which poverty and low household SEC may be both a cause and consequence of disability are outlined in the reviews and the qualitative studies. The association of poor SECs with learning disability and behaviour problems was the most consistent finding and these studies had low/medium risk of bias. Where overall disability was the outcome of interest, findings were divergent and many studies had a high/medium risk of bias. Qualitative studies were methodologically weak.

CONCLUSIONS

This review indicates that, despite socially and biologically plausible mechanisms underlying the association of low household SEC with childhood disability in LAMI countries, the empirical evidence from quantitative studies is inconsistent and contradictory. There is evidence for a bidirectional association of low household SEC and disability and longitudinal data is needed to clarify the nature of this association.

Relation of home chaos to cognitive performance and behavioral adjustment of Pakistani primary school children

Recent findings from Western developed countries have linked home chaos to children’s cognitive performance and behavioral problems. In the present paper we test whether the same pattern of associations can be replicated in a non-Western developing country. Our sample was 203 Pakistani primary school children. To assess home chaos the Confusion, Hubbub, and Order Scale (CHAOS) was translated into Urdu and administered to mothers. Children were assessed using the parent and teachers rating forms of the Behavioral Assessment System for Children and the Raven's Standard Progressive Matrices. Home chaos was not related to children’s cognitive performance. However, replicating previous findings from Western developed countries, greater home chaos uniquely predicted higher levels of internalizing and externalizing behavioral problems as well as lower levels of adaptive behavior in Pakistani children, as rated by both mothers and teachers.

Behavioral problems among children living in orphanage facilities of Karachi, Pakistan: comparison of children in an SOS Village with those in conventional orphanages

PURPOSE

This study compared the behavioral problems of children living in an SOS Village, which attempts to provide a family setup for its children, with those living in conventional orphanages.

METHODS

We conducted a cross-sectional survey of 330 children, aged 4-16 years, living either in an SOS or other conventional orphanages of Karachi, and assessed their behavioral problems using strengths and difficulty questionnaire (SDQ). Behavioral problems on composite SDQ and subscales, rated by foster mothers, were compared between children in the two groups using χ(2) test of independence. Multivariable models were built, using generalized estimating equations (GEE) regression approach, to identify factors independently associated with behavioral problems.

RESULTS

The overall prevalence of behavioral problems was 33%. On univariate comparison, we found that groups did not differ in their overall behavioral problems, while they were significantly different on the peer problem scale (P = 0.026). The model for composite SDQ behavioral problems identified five factors: wasting, <5 years length of stay in the facility and foster mother's depression, while facility type and sex of the child were part of a significant interaction. Foster mother depression, child's malnourishment and fewer years of stay at the facility were associated with conduct problems, while the child's sex, facility type and child's parental living status were part of two interactions.

CONCLUSION

We found a high burden of behavioral problems among children living in orphanages of Karachi, Pakistan. Foster mothers' depression and child's nutritional status, which are associated with behavioral problems, can be target of interventions to reduce behavioral problems of children living in orphanages.

Prevalence of intellectual disability: a meta-analysis of population-based studies

Intellectual disability is an extremely stigmatizing condition and involves utilization of large public health resources, but most data about its burden is based on studies conducted in developed countries. The aim of this meta-analysis was to collate data from published literature and estimate the prevalence of intellectual disability across all such studies. The review includes studies published between 1980 and 2009, and includes data from populations that provided an overall estimate of the prevalence of intellectual disability. Meta-analysis was done using random effects to account for heterogeneity. Sub-group analyses were also done. The prevalence of intellectual disability across all 52 studies included in the meta-analysis was 10.37/1000 population. The estimates varied according to income group of the country of origin, the age-group of the study population, and study design. The highest rates were seen in countries from low- and middle income countries. Studies based on identification of cases by using psychological assessments or scales showed higher prevalence compared to those using standard diagnostic systems and disability instruments. Prevalence was higher among studies based on children/adolescents, compared to those on adults. Higher prevalence in low and middle income group countries is of concern given the limitations in available resources in such countries to manage intellectual disability. The importance of using standardized diagnostic systems to correctly estimate the burden is underlined. The public health and research implications of this meta-analysis have been discussed.

The mental health workforce gap in low- and middle-income countries: a needs-based approach

OBJECTIVE

To estimate the shortage of mental health professionals in low- and middle-income countries (LMICs).

METHODS

We used data from the World Health Organization's Assessment Instrument for Mental Health Systems (WHO-AIMS) from 58 LMICs, country-specific information on the burden of various mental disorders and a hypothetical core service delivery package to estimate how many psychiatrists, nurses and psychosocial care providers would be needed to provide mental health care to the total population of the countries studied. We focused on the following eight problems, to which WHO has attached priority: depression, schizophrenia, psychoses other than schizophrenia, suicide, epilepsy, dementia, disorders related to the use of alcohol and illicit drugs, and paediatric mental disorders.

FINDINGS

All low-income countries and 59% of the middle-income countries in our sample were found to have far fewer professionals than they need to deliver a core set of mental health interventions. The 58 LMICs sampled would need to increase their total mental health workforce by 239,000 full-time equivalent professionals to address the current shortage.

CONCLUSION

Country-specific policies are needed to overcome the large shortage of mental health-care staff and services throughout LMICs.

A report on disability and rehabilitation medicine in Pakistan: past, present, and future directions

Disability is a stigma in Pakistan, and cultural norms are a hindrance to the integration of the disabled into the community. Additional barriers to addressing the needs of the disabled include the lack of reliable disability epidemiologic data, inadequate funding and poor health care infrastructure, and workforce shortages. The aim of this report is to present an overview of Physical Medicine and Rehabilitation (PM&R) in Pakistan, covering its origins, current status, and future directions. An electronic literature search (1950-2009) was conducted using the Medline, ScienceDirect, Springer Link, CINAHL, and Google Scholar databases. The key words used were "disability," "persons with disability" (PWDs), "rehabilitation," "Pakistan," "developing countries," "stroke," "spinal cord injury," "causes," "attitudes," "physiotherapy," "occupational therapy," and "speech therapy." Only publications in English involving physical disability were selected. Statistical data were obtained from the Federal Bureau of Statistics. Interviews with pioneers of rehabilitation medicine in Pakistan, PWDs, and their families were conducted. The origins of PM&R in Pakistan date to the 1960s, but the formal training program began only in 1997. There are only a few rehabilitation departments, and none have all the standard components of a rehabilitation team. The number of practicing rehabilitation consultants is 38. There are an estimated 1000 physical therapists and 150 occupational therapists. There is a need to increase the number of rehabilitation facilities significantly, staff them appropriately, and make them accessible to all who need them, including rural and remote regions. Discrimination should be addressed by education and legislation.

The prevalence of neurological disorders in Saudi children: a community-based study

There are limited data on the pattern and prevalence of pediatric chronic neurologic conditions in the region. Therefore, the objective of this study was to establish the prevalence of these disorders in the Kingdom of Saudi Arabia. A multistage probability sampling design was used to select a random sample of Saudi households representative of the Saudi population. A total of 45 682 Saudi children were screened. Of these children, 313 had a chronic major neurologic disorder indicating a prevalence of 68.5 per 10 000 children, which was the highest among all chronic diseases in children. Mental retardation and cerebral palsy were the most common neurologic disorders among Saudi children with a prevalence rate of 26.3/10 000 and 23.4/10 000, respectively. The finding that major neurologic disorders are the most common pediatric chronic disorders in the Kingdom of Saudi Arabia indicates that priority should be given to research and education as well as health care planning.

The genetic basis of non-syndromic intellectual disability: a review

Intellectual disability (ID), also referred to as mental retardation (MR), is frequently the result of genetic mutation. Where ID is present together with additional clinical symptoms or physical anomalies, there is often sufficient information available for the diagnosing physician to identify a known syndrome, which may then educe the identification of the causative defect. However, where co-morbid features are absent, narrowing down a specific gene can only be done by ‘brute force’ using the latest molecular genetic techniques. Here we attempt to provide a systematic review of genetic causes of cases of ID where no other symptoms or co-morbid features are present, or non-syndromic ID. We attempt to summarize commonalities between the genes and the molecular pathways of their encoded proteins. Since ID is a common feature of autism, and conversely autistic features are frequently present in individuals with ID, we also look at possible overlaps in genetic etiology with non-syndromic ID.

Missed opportunities in surveillance and screening systems to detect developmental delay: A developing country perspective

The future of human societies depends on children being able to achieve their optimal physical and psychological development. Developmental delay is failure to acquire age-appropriate functionality. It may involve one or more streams of development. Responsive parenting has potential to promote better development. Primary health physicians are in the best arrangement to provide this assistance as they can monitor child's development longitudinally and understand the child's developmental trajectory better. Current strategy employed by majority of primary-care providers to monitor the trajectory is termed 'developmental surveillance'. It is "a flexible, continuous process whereby knowledgeable professionals perform skilled observations of children during the provision of health care". Age-appropriate developmental checklists are also used to record milestones as part of surveillance. Both, the American Academy of Pediatrics and the British Joint Working Party on Child Health Services, recommend developmental surveillance by physicians as a method of identification of developmental delays. Developmental screening, however, improves the accuracy of identifying children with delay, compared with surveillance. Primary health physicians should consider using developmental screening tools that are standardized, reliable, valid and practical in the office setting, be familiar with screening techniques which should be incorporated into ongoing care, and keep abreast of current literature. Pakistan, as a developing country, needs specific strategies to ensure that we seize all the chances to detect this delay at an earlier age and introduce intervention, in order to lessen the burden of the disability on child, family and society.

Mental retardation and consanguinity in a selected region of the Israeli Arab community

The prevalence of genetic diseases and congenital malformation in the Israeli Arab community is relatively high, but its distribution is not uniform. The aim of this study was to estimate the frequency of mental retardation disorders in children living in 5 Israeli Arab villages and determine its association with consanguinity. Mental retardation was found to affect 300 children in the screened population, yielding an overall prevalence of 14.5 per 1000. Most of those affected (68%) were the offspring of consanguineous marriages. One village with a high prevalence (4.3%) of neurological hereditary diseases was studied in detail. The prevalence of neurological hereditary diseases and mental retardation associated with consanguinity in these children highlights the need to implement appropriate preventive program.

Primary care treatment for child and adolescent neuropsychiatric conditions in remote rural Punjab, Pakistan - a cross-sectional survey

BACKGROUND

Pakistan is one of the most populous regions of the world. Previous work has demonstrated that there is reliance on traditional healthcare systems when seeking psychiatric care; however, there is a lack of information on help seeking for child and adolescent population. The aim of this study was to describe types of treatments and families' perceptions of the effectiveness of those treatments for childhood neuropsychiatric disorders in remote rural Punjab.

METHOD

Cross-sectional survey of consecutive attendees at an advertised mental health consultation day in a remote rural area.

RESULTS

The effectiveness of these treatments, as rated by patients and their families, was variable, with highest reported effectiveness for general practitioner treatments. In families with a past history of care from a general practitioner, those who had epilepsy reported treatments to be more effective than those with mental retardation. Carers and users described consulting five different types of primary healthcare practitioners that used both physical and psychotherapeutic treatments.

CONCLUSIONS

There is considerable variation in treatments available for child and adolescent neuropsychiatric disorders in remote rural areas of Punjab, a large proportion of which are considered ineffective by the users and carers. This highlights the need to develop effective interventions for child and adolescent neuropsychiatric conditions that can be administered by primary health workers. Our data suggest that the need for this is greatest for mental retardation.

Childhood disability in low- and middle-income countries: overview of screening, prevention, services, legislation, and epidemiology

BACKGROUND

Childhood disability affects millions of children around the world, most of whom are in low- and middle-income countries. Despite the large burden on child development, family life, and economics, research in the area of childhood disability is woefully inadequate, especially from low- and middle-income countries.

OBJECTIVE

The objective of this review was to generate information about current knowledge on childhood disability in low- and middle-income countries and identify gaps to guide future research.

METHODS

Electronic databases (PubMed, Embase, PsycInfo) were searched by using specific search terms related to childhood disability in developing countries. The Cochrane Library was also searched to identify any similar reviews. Whole texts of articles that met study criteria were scrutinized for information regarding research method, screening tools, epidemiology, disability-related services, legislation, and prevention and promotion activities. Quantitative and qualitative information was collated, and frequency distributions of research parameters were generated.

RESULTS

Eighty articles were included in the review (41 from low-income countries). Almost 60% of the studies were cross-sectional; case-control, cohort, and randomized, controlled trials accounted for only 15% of the studies. Of the 80 studies, 66 focused on epidemiologic research. Hearing (26%) and intellectual (26%) disabilities were the commonly studied conditions. The Ten Questionnaire was the most commonly used screening tool. Information on specific interventions, service utilization, and legislation was lacking, and study quality generally was inadequate. Data on outcomes of morbidities, including delivery complications and neonatal and early childhood illness, is particularly lacking.

CONCLUSIONS

With this review we identified potential gaps in knowledge, especially in the areas of intervention, service utilization, and legislation. Even epidemiologic research was of inadequate quality, and research was lacking on conditions other than hearing and intellectual disabilities. Future researchers should not only address these gaps in current knowledge but also take steps to translate their research into public health policy changes that would affect the lives of children with disabilities in low- and middle-income countries.

Poverty and people with intellectual disabilities

Epidemiological studies have consistently reported a significant association between poverty and the prevalence of intellectual disabilities. The available evidence suggests that this association reflects two distinct processes. First, poverty causes intellectual disabilities, an effect mediated through the association between poverty and exposure to a range of environmental and psychosocial hazards. Second, families supporting a child with intellectual disabilities and adults with intellectual disabilities are at increased risk of experiencing poverty due to the financial and social impact of caring and the exclusion of people with intellectual disabilities from the workforce. It is likely that the association between poverty and intellectual disabilities accounts in part for the health and social inequalities experienced by people with intellectual disabilities and their families. Implications for policy and practice are discussed in relation to the funding of services for people with intellectual disabilities and preventative approaches to addressing the health and social inequalities experienced by people with intellectual disabilities and their families.

Consanguineous unions and child health in the State of Qatar

The aim of the study was to estimate the prevalence and sociodemographic predictors of consanguineous unions in the State of Qatar and to assess the association between consanguinity, fertility and child health. A representative sample of 1800 Qatari women aged > or =15 years was approached for the study. Of these, 1515 (84.2%) women agreed to participate. The consanguineous marriage rate was 54.0% with estimated population confidence limits of 52.3-55.7%. First cousin unions were the most common form of cousin marriage. The level of parental consanguinity (both in the respondent's parents and her parents-in-law) was quite high. In a multivariable analysis, both education of the respondent and her husband as well as parental consanguinity were found to be strong predictors of consanguineous unions in the index generation. Although fertility was high in both groups, the mean number of pregnancies was somewhat higher in respondents with first cousin unions. Concomitantly they also had a slighter higher rate of livebirths than women in non-consanguineous unions. The occurrence of asthma, mental retardation, epilepsy and diabetes was significantly more common in offspring of all consanguineous than non-consanguineous couples.

Prevalence and psychosocial correlates of global developmental delay in 3-year-old children in the United Arab Emirates

OBJECTIVE

Developmental disabilities are lifelong conditions with considerable public health impact, incurring substantial financial and societal costs. Data on prevalence and associated factors can provide the basis for setting priorities and designing interventions.

METHODS

A representative random sample of 694 United Arab Emirates national children aged 3 years were evaluated in a two-stage epidemiological study.

RESULTS

Stage 1 screening using the Denver Developmental Screening Test found that 8.4% [confidence interval (CI): 6.4-10.7] had global developmental delay (GDD). Using clinical diagnostic interview in Stage 2, the weighted prevalence for clinically significant developmental disability was estimated to be 2.44% (CI: 1.28-3.56). GDD was associated with pregnancy and birth complications, poor maternal education, family history of developmental problems, and major traumatic life events, as well as behavioral problems in children.

CONCLUSION

Our findings suggest the need for comprehensive and early screening programs for developmental problems, and the importance of training medical and child care professionals accordingly.

Prevalence and risk factors of neurological disability and impairment in children living in rural Kenya

BACKGROUND

There is little data on the burden of neurological impairment (NI) in developing countries, particularly in children of Africa.

METHODS

We conducted a survey of NI in children aged 6-9 years in a rural district of Kenya. First, we screened for neurological disability by administering the Ten Questions Questionnaire (TQQ) to parents/guardians of children in a defined population. In phase two, we performed a comprehensive clinical and psychological assessment on children who tested positive on TQQ and on a similar number of children who tested negative.

RESULTS

A total of 10 218 children were screened, of whom 955 (9.3%) were positive on TQQ. Of these, 810 (84.8%) were assessed, and of those who tested negative 766 (8.3%) were assessed. The prevalence for moderate/severe NI was 61/1000 [95% confidence interval (95% CI) 48-74]. The most common domains affected were epilepsy (41/1000), cognition (31/1000), and hearing (14/1000). Motor (5/1000) and vision (2/1000) impairments were less common. Of the neurologically impaired children (n = 251), 56 (22%) had more than one impairment. Neonatal insults were found to have a significant association with moderate/severe NI in both the univariate [odds ratio (OR) = 1.70; 95% CI 1.12-2.47] and multivariate analyses (OR = 1.30; 95% CI 1.09-1.65).

CONCLUSIONS

There is a considerable burden of moderate/severe NI in this area of rural Kenya, with epilepsy, cognition, and hearing being the most common domains affected. Neonatal insults were identified as an important risk factor.