Does An Early Intervention Influence Behavioral Development Until Age 9 in Children Born Prematurely?

Executive and attentional functioning interventions in preterm children: a systematic review

OBJECTIVE

This systematic review, performed in accordance with the PRISMA guidelines, seeks to summarize the interventions that have been developed in order to improve executive functioning and attention in children born prematurely.

METHODS

The PICOS framework helped guide the structure and relevant terms selected for the study. Electronic systematic searches of the databases PubMed (NLM), Ovid Medline, Ovid All EBM Reviews, Ovid Embase, and Ovid PsycINFO were completed in March 2022. This review focuses on interventions that target attention and executive functioning in prematurely born children between birth and 12 years old, with outcome measures assessed between 3 and 12 years old, even if the age range in the study can exceed our own parameters. Data extraction included sample characteristics, country of recruitment, type of intervention, description of the intervention group and control group, outcome measures, and overall results. An assessment of the quality of methodology of studies was performed through an adaptation of the Downs and Black checklist for both randomized and nonrandomized studies in healthcare interventions. An assessment of the risk of bias was also presented using the Cochrane risk of bias tool for randomized trials 2.0.

RESULTS

A total of 517 premature children received an intervention at some point between birth and early adolescence. Eleven different interventions were assessed in 17 studies, with rating of the quality of methodology and outcomes ranging from lower quality studies (44% quality rating) to robust studies (96% quality rating) in terms of reporting standards, external and internal validity, and power. Five of those studies focused on interventions administered in the neonatal intensive care unit or shortly postdischarge (e.g., the Mother-Infant Transaction Program and the Newborn Individualized Developmental Care and Assessment Program, documented in two articles each [11%] or the Infant Behavioral Assessment and Intervention Program assessed in one study [about 5%]), while 12 articles reported on interventions administered between the ages of 1.5-12 years old [mostly computerized cognitive training programs such as Cogmed (23%) and BrainGame Brian (17%)]. Of the 17 articles examined, 12 (70%) showed positive short-term outcomes postintervention and 3 (17%) demonstrated positive long-term results with small to large effect sizes (0.23-2.3). Among included studies, 50% showed an overall high risk of bias, 21.4% showed some concerns, and 28.6% were low risk of bias.

CONCLUSIONS

Due to the heterogeneity of the programs reviewed, the presented findings should be interpreted as descriptive results. A careful and individualized selection from the various available interventions should be made based on the target population (i.e., age at intervention administration and outcome testing) before implementing these program protocols in clinical settings.

Parental reports of hospital- and community-based follow-up services, self-efficacy, and symptoms of depression a few months after discharge of a prematurely born child

BACKGROUND

Many parents report the transition from hospital to home as challenging after the birth of a preterm-born child. This study investigates parental perceptions of community-based follow-up services after hospital discharge, alterations in parental self-efficacy during the early months at home, the prevalence of depressive symptoms among parents, and the relationship between these factors and both NICU experiences and children's regulative behaviors.

METHODS

In this second phase of a descriptive study, 110 parents returned a digital questionnaire when their child was four months corrected for prematurity. Parents were recruited while hospitalized with their child, in one of eight Norwegian neonatal intensive care units (NICUs). Thus, the study provides insight into follow-up services across a broad geographical range. Parents' perception of self-efficacy was reported on the Karitane Parenting Confidence Scale, and depressive symptoms were evaluated with the Edinburgh Postnatal Depression Scale (EPDS). Children's regulative behavior was reported on the 6-month version of the Ages and Stages Questionnaire: Social and Emotional (ASQ: SE). Using SPSS, associations between variables were investigated in multiple regression analysis in addition to descriptive analysis. Additionally, the examination of repeated measures of parental self-efficacy involved the application of linear mixed models.

RESULTS

Parents reported improved perception of self-efficacy from postdischarge to the children's age of four months (F (1,167) = 1233.2, p < 0.001). On average, fathers' self-efficacy improved more than that of mothers. Parents' perception of being well informed prior to discharge from hospital predicted improved self-efficacy (F [1, 29] = 10.4, p = 0.003). Reports of depressive symptoms were at a similar level as previously reported among new parents, as 10.4% of mothers and 6.7% of fathers reported EPDS scores ≥ 10 points. Parents' reports on ASQ: SE show that 15% of the children scored above the recommended cutoff score for three- to nine-month-old children. The parent-reported benefit of follow-up services showed considerable variation. The importance of specific knowledge about prematurity among public health nurses and physicians was frequently mentioned, and public health nurses were perceived as coordinators and mediators of various services.

CONCLUSIONS

Parents reported improved self-efficacy, and depressive symptoms at similar levels as new parents in general, a few months after discharge from hospital. Childrens' regulatory behavior were reported at levels comparable with term-born infants.

Investigating behaviour from early- to mid-childhood and its association with academic outcomes in a cohort of children born at risk of neonatal hypoglycaemia

High rates of academic underachievement at 9-10 years have been identified in children born at risk of neonatal hypoglycaemia. This study investigated the stability of behaviour from early to mid-childhood and how this relates to academic outcomes in children born with at least one risk factor of neonatal hypoglycaemia in Aotearoa, New Zealand. Behaviour data was collected using the Bayley Scales of Infant and Toddler Development, Child Behaviour Checklist 1.5-5, and the Strengths and Difficulties Questionnaire for 466 children (52 % male; 27 % Māori, 60 % New Zealand European, 2 % Pacific, 11 % Other) at multiple timepoints between ages 2 and 10 years. Academic data was collected at 9-10 years using the e-asTTle online learning and assessment tool. Findings revealed a link between early childhood behaviour and academic outcomes could be detected as early as age 2, suggesting that identifying and addressing early behavioural issues in children at risk of neonatal hypoglycaemia could aid in targeted interventions.

Protocol for a randomized controlled trial to evaluate a year-long (NICU-to-home) evidence-based, high dose physical therapy intervention in infants at risk of neuromotor delay

INTRODUCTION

Developmental disabilities and neuromotor delay adversely affect long-term neuromuscular function and quality of life. Current evidence suggests that early therapeutic intervention reduces the severity of motor delay by harnessing neuroplastic potential during infancy. To date, most early therapeutic intervention trials are of limited duration and do not begin soon after birth and thus do not take full advantage of early neuroplasticity. The Corbett Ryan-Northwestern-Shirley Ryan AbilityLab-Lurie Children's Infant Early Detection, Intervention and Prevention Project (Project Corbett Ryan) is a multi-site longitudinal randomized controlled trial to evaluate the efficacy of an evidence-based physical therapy intervention initiated in the neonatal intensive care unit (NICU) and continuing to 12 months of age (corrected when applicable). The study integrates five key principles: active learning, environmental enrichment, caregiver engagement, a strengths-based approach, and high dosage (ClinicalTrials.gov identifier NCT05568264).

METHODS

We will recruit 192 infants at risk for neuromotor delay who were admitted to the NICU. Infants will be randomized to either a standard-of-care group or an intervention group; infants in both groups will have access to standard-of-care services. The intervention is initiated in the NICU and continues in the infant's home until 12 months of age. Participants will receive twice-weekly physical therapy sessions and caregiver-guided daily activities, assigned by the therapist, targeting collaboratively identified goals. We will use various standardized clinical assessments (General Movement Assessment; Bayley Scales of Infant and Toddler Development, 4th Edition (Bayley-4); Test of Infant Motor Performance; Pediatric Quality of Life Inventory Family Impact Module; Alberta Infant Motor Scale; Neurological, Sensory, Motor, Developmental Assessment; Hammersmith Infant Neurological Examination) as well as novel technology-based tools (wearable sensors, video-based pose estimation) to evaluate neuromotor status and development throughout the course of the study. The primary outcome is the Bayley-4 motor score at 12 months; we will compare scores in infants receiving the intervention vs. standard-of-care therapy.

Two-year motor outcomes associated with the dose of NICU based physical therapy: The Noppi RCT

BACKGROUND

Interventions involving both the parent and the preterm infant have demonstrated lasting effects on cognitive outcomes, but motor effects are less salient. It remains unclear when to commence early intervention and if dosages have impact on motor outcomes.

AIMS

To examine the effect on motor performance at 24-months corrected age following a parent-administered intervention performed with infants born preterm in the NICU. Intervention dosing and longitudinal motor performance were also analyzed.

STUDY DESIGN

Single-blinded randomized multicenter clinical trial.

SUBJECTS

153 infants born, gestational age ≤ 32 weeks at birth, were randomized into intervention or control group.

OUTCOME MEASURES

Infant Motor Performance Screening Test, Test of Infant Motor Performance, Peabody Developmental Motor Scales-2.

RESULTS

No significant difference was found between the intervention and the control group assessed with the PDMS-2 at 24-months CA. However, a significant positive association was found between dosing and the Gross Motor and Total Motor PDMS-2 scores. Analysis of longitudinal motor performance showed a decreasing motor performance between 6- and 24-months corrected age in both groups.

CONCLUSIONS

There was no difference in motor performance between groups at 24-months corrected age. However, increased intervention dosage was positively associated with improved motor outcome.

Moderate low birth weight and socioemotional competence among children: The role of parenting factors in early childhood

BACKGROUND

Although the importance of birth weight for socioemotional trajectories among children has become a topic of growing interest for researchers, the majority of prior studies were limited to the more extreme subgroups of low birth weight children.

PURPOSE

The purpose of this study was to examine the longitudinal associations among moderate low birth weight status, parenting factors, and socioemotional competence among at-risk children. This paper also examined the role of parenting factors as a moderator in the associations between birth weight and indicators of socioemotional competence at age 9.

METHODS

Participants include a subsample (N = 1809) of families participating in the Fragile Families and Child Wellbeing Study, a national longitudinal birth cohort study. Birth weight and prenatal data were taken from medical records. Parenting factors were assessed during in-home assessments at ages 3 and 5. Teachers reported on externalizing behaviors and social skills at age 9. Structural equation modeling was used to examine the associations among study variables.

RESULTS

Overall, results indicate that moderate low birth weight was significantly associated with lower levels of teacher-reported socioemotional competence at age 9 even after accounting for a large battery of control variables. Results also showed that maternal warmth, but not parenting stress, moderated the longitudinal association between birth weight and indicators of socioemotional competence.

CONCLUSION

Findings highlight the importance of birth weight and positive parenting processes in socioemotional outcomes among children. The implications of these findings are discussed for targeting positive parenting interventions and developmental outcomes for at-risk children.

Early Intervention in Families with Preterm Infants: A Review of Findings from a Randomized Controlled Trial Following Children Up to 9 Years of Age

The Tromsø Intervention Study on Preterms (TISP) randomized 146 preterm born children (<2000 g) either to the Mother-Infant Transaction Program-Modified (MITP-M, n = 72) or to a preterm control group (n = 74). In addition, 75 full-term babies were followed up until 9 years of age. TISP was conducted at the University Hospital Northern Norway (UNN) and only infants who did not have congenital anomalies and families where the mothers’ native language was Norwegian were included. The study investigates the effect of MITP-M on cognitive and social development including behavioral problems, quality of life and stress in the family. The results have so far been published in various journals. The aim of this article is to give a comprehensive overall presentation of the main findings and discuss implications for clinical practice and further research. Parents in the intervention group were superior in “reading” their infants’ temperament, and at 3, 5 and 7 years of age the intervention group scored significantly higher on well-known tests of cognitive outcome. At 9 years of age, the intervention group had fewer attentional problems, better school achievements and a better quality of life. From the first year onwards, mothers and fathers in the intervention group reported lower levels of stress than parents of in the preterm control group.

Early Intervention in Families with Preterm Infants: A Review of Findings from a Randomized Controlled Trial Following Children Up to 9 Years of Age

The Tromsø Intervention Study on Preterms (TISP) randomized 146 preterm born children (<2000 g) either to the Mother-Infant Transaction Program-Modified (MITP-M, n = 72) or to a preterm control group (n = 74). In addition, 75 full-term babies were followed up until 9 years of age. TISP was conducted at the University Hospital Northern Norway (UNN) and only infants who did not have congenital anomalies and families where the mothers’ native language was Norwegian were included. The study investigates the effect of MITP-M on cognitive and social development including behavioral problems, quality of life and stress in the family. The results have so far been published in various journals. The aim of this article is to give a comprehensive overall presentation of the main findings and discuss implications for clinical practice and further research. Parents in the intervention group were superior in “reading” their infants’ temperament, and at 3, 5 and 7 years of age the intervention group scored significantly higher on well-known tests of cognitive outcome. At 9 years of age, the intervention group had fewer attentional problems, better school achievements and a better quality of life. From the first year onwards, mothers and fathers in the intervention group reported lower levels of stress than parents of in the preterm control group.

Effects of a Parent-Administered Exercise Program in the Neonatal Intensive Care Unit: Dose Does Matter-A Randomized Controlled Trial

BACKGROUND

Despite the risk of delayed motor development in infants born preterm, knowledge about interventions in the neonatal intensive care unitt (NICU) and the effects of dosing is sparse.

OBJECTIVE

The objectives of this study were to examine the effectiveness of a parent-administered exercise program in the NICU on motor outcome at 3 months corrected age (CA) and the effect of dosing on motor performance.

DESIGN

This was a randomized clinical trial.

SETTING

The study was conducted at 3 university hospitals in Tromsø, Trondheim, and Oslo, Norway.

PARTICIPANTS

A total of 153 infants with gestational age <32 weeks at birth were randomly assigned to intervention or control groups.

INTERVENTION

A 3-week parent-administered intervention designed to facilitate movements in preterm infants was performed in the NICU. Parents were asked to administer the intervention 10 minutes twice a day.

MEASUREMENTS

Test of Infant Motor Performance (TIMP) was used to assess short-term outcome at 3 months CA.

RESULTS

No significant difference in the TIMP z-score was found between intervention and control groups at follow-up 3 months CA, but a significant positive relationship was found between total intervention dose and TIMP z-scores. The adjusted odds of having a clinical z-score < 0 at 3 months CA was about 6 times higher for infants with less than median intervention time than for infants with a longer intervention time.

LIMITATIONS

The number of infants born before 28 weeks was small. A spillover effect in favor of the control group was possible. We do not know if the infants received physical therapy after discharge from the hospital.

CONCLUSIONS

There was no difference in motor performance between the intervention group and the control group at 3 months CA. However, an increased intervention dose was positively associated with improved motor outcome.

Temperamental Development among Preterm Born Children. An RCT Follow-Up Study

A randomized controlled trial study recruited 146 preterm born children, either to participate in a modified version of the Mother–Infant Transaction Program (MITP-m) or to receive the usual follow-up services, before and after discharge from a neonatal intensive care unit. This follow-up study investigates whether MITP participation is associated with parental perceptions of child temperament from two to seven years. Children’s temperament was reported by mothers and fathers separately at children’s ages of 2, 3, 5, and 7 years. Parents in the MITP-m group reported lower levels of negative emotionality in their children compared to the control group. In maternal reports, a group effect (F(1, 121) = 9.7, p = 0.002) revealed a stable difference in children’s negative emotionality from two to seven years, while a group-by-time interaction related to an increasing difference was detected in reports from fathers (F(1, 94) = 4.8, p = 0.03). Another group difference appeared in fathers’ reports of children’s soothability (F(1, 100) = 14.2, p < 0.0005). MITP-m fathers seemed to perceive their children as easier to soothe at all ages as no interaction with time appeared. Parental reports on children’s sociality, shyness, and activity did not differ between the groups.

Stockholm preterm interaction-based intervention (SPIBI) - study protocol for an RCT of a 12-month parallel-group post-discharge program for extremely preterm infants and their parents

BACKGROUND

Improved neonatal care has resulted in increased survival rates among infants born after only 22 gestational weeks, but extremely preterm children still have an increased risk of neurodevelopmental delays, learning disabilities and reduced cognitive capacity, particularly executive function deficits. Parent-child interaction and parental mental health are associated with infant development, regardless of preterm birth. There is a need for further early interventions directed towards extremely preterm (EPT) children as well as their parents. The purpose of this paper is to describe the Stockholm Preterm Interaction-Based Intervention (SPIBI), the arrangements of the SPIBI trial and the chosen outcome measurements.

METHODS

The SPIBI is a randomized clinical trial that includes EPT infants and their parents upon discharge from four neonatal units in Stockholm, Sweden. Inclusion criteria are EPT infants soon to be discharged from a neonatal intensive care unit (NICU), with parents speaking Swedish or English. Both groups receive three initial visits at the neonatal unit before discharge during the recruitment process, with a strengths-based and development-supportive approach. The intervention group receives ten home visits and two telephone calls during the first year from a trained interventionist from a multi-professional team. The SPIBI intervention is a strengths-based early intervention programme focusing on parental sensitivity to infant cues, enhancing positive parent-child interaction, improving self-regulating skills and supporting the infant's next small developmental step through a scaffolding process and parent-infant co-regulation. The control group receives standard follow-up and care plus extended assessment. The outcomes of interest are parent-child interaction, child development, parental mental health and preschool teacher evaluation of child participation, with assessments at 3, 12, 24 and 36 months corrected age (CA). The primary outcome is emotional availability at 12 months CA.

DISCUSSION

If the SPIBI shows positive results, it could be considered for clinical implementation for child-support, ethical and health-economic purposes. Regardless of the outcome, the trial will provide valuable information about extremely preterm children and their parents during infancy and toddlerhood after regional hospital care in Sweden.

TRIAL REGISTRATION

The study was registered in ClinicalTrials.gov in October 2018 (NCT03714633).

A scoping review of mental health prevention and intervention initiatives for infants and preschoolers at risk for socio-emotional difficulties

BACKGROUND

Infant mental health has emerged as a unique area of practice and research distinguished from child and youth sub-specialties by its advocacy for a relational practice framework with an emphasis on parents/caregivers being integral to assessment, treatment, and prevention initiatives. A diverse array of initiatives offered across a broad spectrum of delivery methods is available to clinicians. However, to date, a large-scale mapping of the research evidence regarding these interventions has yet to be completed to help inform clinician's decisions regarding the best approaches for their clients. To address this knowledge gap, this study aimed to report on the landscape of research pertaining to mental health interventions for infants and preschoolers (0-5 years), and their families at risk for socio-emotional difficulties and negative developmental outcomes.

METHOD

A scoping review methodology was used to conduct a large-scale mapping of the intervention research pertaining to infants and preschoolers (0-5) at risk for socio-emotional difficulties. We searched MEDLINE, PsycINFO, EMBASE, Web of Science, The Cochrane Library, CINAHL, LILACS, ProQuest Nursing & Allied Health Source, World Cat, and ClinicalTrials.gov , from inception to December 31, 2012. We extracted information regarding publication date, geographical location, study design, level of risk, population, key intervention mechanism, and outcome measures.

RESULTS

We identified 533 potential studies from 1233 title and abstracts after the first round of screening. Full text article review in the second round of screening resulted in a total of 162 included articles for the final analysis. Results indicated that over 50% of interventions evaluated were randomized controlled trials conducted in Westernized countries. Most studies could be subdivided by level of risk within a preventative public health framework including universal, selected, indicated, and direct treatment for children formally diagnosed with a mental disorder. Risk factors experienced by children and their families were heterogeneously defined and numerous outcome measures across included studies. The results of this study are limited to the last search date of 2012.

CONCLUSIONS

Key intervention mechanisms spanned a range of approaches including parenting groups, dyadic, in-home, cognitive-behavioral therapy, and day care-based interventions. The findings are discussed in terms of implications for broad trends and gaps in research and policy for this population.

Impact of Nonmedical Factors on Neurobehavior and Language Outcomes of Preterm Infants

Preterm infants are at increased risk for adverse neurodevelopmental outcomes. The impact of maternal, NICU, and social environmental factors on early neurobehavior and language outcomes of preterm infants is recognized. There is a need for health care professionals to have a clear understanding of the importance of facilitating positive mother-infant relationships, and to address not only the infant's sensory and language environment, but also focus on adverse maternal mental health and social adversities to optimize infant outcomes.

Stability and Change in Longitudinal Associations between Child Behavior Problems and Maternal Stress in Families with Preterm Born Children, Follow-Up after a RCT-Study

The Tromsø Intervention Study on Preterms (TISP) randomized 146 preterm-born children either to the Mother-Infant Transaction Program (MITP) or to a preterm control group. Previously, significant reductions of child behavior problems and maternal stress have been reported in the intervention group. This follow-up study examines whether the MITP may have affected the longitudinal adaptation between mothers and their children from two until nine years, expressed as associations between different behavioral problems and parenting stress reported by mothers. Associations between internalizing, attentional, and social problems and different dimensions of parenting stress were analyzed in separate models that included effects of time and group status. The MITP did not influence the development of longitudinal associations as no significant three-way interaction (stress*group*time) was found. Significant stress by group interactions was only found in reports on children's attentional problems when analyzed with parent- or interaction-related stress. Mothers who had participated in the MITP reported weaker stress⁻behavior associations than control mothers. This effect was moderated by two independent variables, namely children's birthweight and years of maternal education for the parent⁻child difficult interaction stress.

Behavioral Health Service Utilization and Unmet Need After Traumatic Brain Injury in Childhood

OBJECTIVE

The need for behavioral health services, service utilization, and predictors of utilization was examined in children with moderate-to-severe traumatic brain injury (TBI) relative to a comparison group of children with orthopedic injury (OI) 6.8 years after injury.

METHODS

A total of 130 children hospitalized for moderate-to-severe TBI (16 severe and 42 moderate) or OI (72) between the ages of 3 and 7 years, who were enrolled at the time of injury at 3 tertiary care children's hospital and one general hospital in Ohio, and completed a long-term follow-up 6.8 years after injury were included in analyses.

RESULTS

Adolescents with TBI (moderate [38%] and severe [69%]) had significantly greater rates of need than those with OI (17%). Behavioral health services were utilized by 10% of the sample with no injury group differences (OI: 6%; moderate: 17%; severe: 13%). Early treatment and white race were associated with less service utilization; 77% had an unmet need, with no injury group differences (OI: 75%; moderate: 75%; severe: 82%). Rate of unmet need was greater among white than non-white children.

CONCLUSION

Children who sustain a TBI in early childhood experience persistent and clinically significant impairments even years after injury. Rates of unmet need were high for all injury groups. Findings underscore the importance of long-term monitoring to identify developing needs and prevent significant complications/deficits.

Creating a Holding Environment for Caregivers

The quality of care that families and infants receive during their time on the neonatal unit will be influenced by the well-being of the people who care for them. The emotional work of caring for infants and families in this demanding setting often goes unrecognized and can result in stress, burnout, and compassion fatigue, which in turn are a threat to the quality of care. Resilience and well-being can be fostered by encouraging self-maintenance, supportive systems organization, providing a healthy working environment, education, and opportunities for reflection.

Early intervention influences positively quality of life as reported by prematurely born children at age nine and their parents; a randomized clinical trial

Background

The Tromsø Intervention Study on Preterms evaluates an early, sensitizing intervention given to parents of prematurely born children (birth-weight < 2000 g). The current study investigated the potential influence of the intervention on children’s self-reported and parental proxy-reported quality of life (QoL) at children’s age of nine.

Methods

Participants were randomized to either intervention (PI, n = 72) or preterm control (PC, n = 74) in the neonatal care unit, while healthy term-born infants were recruited to a term reference group (TR, n = 75). The intervention was a modified version of the Mother-Infant Transaction Program, and comprised eight one-hour sessions during the last week before discharge and four home visits at 1, 2, 4 and 12 weeks post-discharge. The two control groups received care in accordance with written guidelines drawn up at the hospital. Participants and parents reported QoL independently on the Kinder Lebensqualität Fragebogen (KINDL) questionnaire. Differences between groups were analyzed by SPSS; Linear Mixed Models and parent–child agreement were analyzed and compared by intra-class correlations within each group.

Results

On average, children in all groups reported high levels of well-being. The PI children reported better physical well-being than the PC children (p = 0.002). In all other aspects of QoL both the PI and the PC children reported at similar levels as the term reference group. PI parents reported better emotional wellbeing (p = 0.05) and a higher level of contentment in school (p = 0.003) compared with PC parents. Parent–child agreement was significantly weaker in the PI group than in the PC group on dimensions such as emotional well-being and relationships with friends (p < 0.05). PI parents reported QoL similar to parents of terms on all aspects except the subscale self-esteem, while PC parents generally reported moderately lower QoL than TR parents.

Conclusions

This early intervention appears to have generated long-lasting positive effects, improving perceived physical well-being among prematurely born children and parent’s perception of these children’s QoL in middle childhood.

Trial registration

Clinical Trials Gov NCT00222456.

Early intervention program reduces stress in parents of preterms during childhood, a randomized controlled trial

Background

It is well documented that heightened levels of parenting stress have a negative influence on children’s socio-emotional and behavioral development. Parenting stress may therefore be regarded as an outcome variable in its own right. This study investigated whether a sensitizing intervention influences stress reported by parents of prematurely born children until the children were age nine.

Methods

Preterm infants (N =146, birth weight <2,000 g) were randomized to intervention (N =72) with the Mother-Infant Transaction Program (MITP) or a preterm control group (N =74) that received standard hospital care. A term reference group comprised 75 healthy, full-term neonates. Parents reported on the Parenting Stress Index (PSI) when the children were 6 months, 1, 2, 3, 5, 7 years old and on the PSI-Short Form (PSI-SF) at age 9. Main outcomes were the mother’s and father’s reports of total, child and parent-related stress. Cross-sectional and longitudinal analyses were performed using linear mixed models (LMM), taking dependency in the data caused by twin pairs and repeated measures into account. Response rates were high across all follow-ups, and still reached 85% from mothers and 72% from fathers at 9 years.

Results

Mothers in the intervention group reported better longitudinal development of child-related stress than mothers of preterm controls, as they perceived their children as being more adaptable and less moody throughout childhood until the age of seven. Less stress in the intervention group was revealed by cross-sectional analysis of maternal reports at all ages, while fathers reported similar differences at ages three and five. Parents in the intervention group reported stronger agreement on several stress scores on several occasions. Fathers with high interventional participation (mean 54%) reported significantly less stress at age nine than those who participated less. Both parents in the intervention group reported levels of stress similar to those experienced by the term reference group at all follow-ups, while differences between the preterm control and term reference groups increased.

Conclusions

This early intervention reduces stress among parents of prematurely born children to a level reported by parents of term-born children and enhances agreement between parents.

Trial registration

Clinical Trials Gov identifier NCT00222456, 05.09.2005.