Structure of a combination of Functional Independence Measure and Instrumental Activity Measure items in community-living persons: a study of individuals with cerebral palsy and spina bifida

Disability Measurement for Korean Community-Dwelling Adults With Stroke: Item-Level Psychometric Analysis of the Korean Longitudinal Study of Ageing

Objective

To investigate the psychometric properties of the activities of daily living (ADL) instrument used in the analysis of Korean Longitudinal Study of Ageing (KLoSA) dataset.

Methods

A retrospective study was carried out involving 2006 KLoSA records of community-dwelling adults diagnosed with stroke. The ADL instrument used for the analysis of KLoSA included 17 items, which were analyzed using Rasch modeling to develop a robust outcome measure. The unidimensionality of the ADL instrument was examined based on confirmatory factor analysis with a one-factor model. Item-level psychometric analysis of the ADL instrument included fit statistics, internal consistency, precision, and the item difficulty hierarchy.

Results

The study sample included a total of 201 community-dwelling adults (1.5% of the Korean population with an age over 45 years; mean age=70.0 years, SD=9.7) having a history of stroke. The ADL instrument demonstrated unidimensional construct. Two misfit items, money management (mean square [MnSq]=1.56, standardized Z-statistics [ZSTD]=2.3) and phone use (MnSq=1.78, ZSTD=2.3) were removed from the analysis. The remaining 15 items demonstrated good item fit, high internal consistency (person reliability=0.91), and good precision (person strata=3.48). The instrument precisely estimated person measures within a wide range of theta (−4.75 logits < θ < 3.97 logits) and a reliability of 0.9, with a conceptual hierarchy of item difficulty.

Conclusion

The findings indicate that the 15 ADL items met Rasch expectations of unidimensionality and demonstrated good psychometric properties. It is proposed that the validated ADL instrument can be used as a primary outcome measure for assessing longitudinal disability trajectories in the Korean adult population and can be employed for comparative analysis of international disability across national aging studies.

Impact of early parenteral nutrition on muscle and adipose tissue compartments during critical illness

OBJECTIVE

The goal of enhanced nutrition in critically ill patients is to improve outcome by reducing lean tissue wasting. However, such effect has not been proven. This study aimed to assess the effect of early administration of parenteral nutrition on muscle volume and composition by repeated quantitative CT.

DESIGN

A preplanned substudy of a randomized controlled trial (Early Parenteral Nutrition Completing Enteral Nutrition in Adult Critically Ill Patients [EPaNIC]), which compared early initiation of parenteral nutrition when enteral nutrition was insufficient (early parenteral nutrition) with tolerating a pronounced nutritional deficit for 1 week in ICU (late parenteral nutrition). Late parenteral nutrition prevented infections and accelerated recovery.

SETTING

University hospital.

PATIENTS

Fifteen EPaNIC study neurosurgical patients requiring prescheduled repeated follow-up CT scans and six healthy volunteers matched for age, gender, and body mass index.

INTERVENTION

Repeated abdominal and femoral quantitative CT images were obtained in a standardized manner on median ICU day 2 (interquartile range, 2-3) and day 9 (interquartile range, 8-10). Intramuscular, subcutaneous, and visceral fat compartments were delineated manually. Muscle and adipose tissue volume and composition were quantified using standard Hounsfield Unit ranges.

MEASUREMENTS AND MAIN RESULTS

Critical illness evoked substantial loss of femoral muscle volume in 1 week's time, irrespective of the nutritional regimen. Early parenteral nutrition reduced the quality of the muscle tissue, as reflected by the attenuation, revealing increased intramuscular water/lipid content. Early parenteral nutrition also increased the volume of adipose tissue islets within the femoral muscle compartment. These changes in skeletal muscle quality correlated with caloric intake. In the abdominal muscle compartments, changes were similar, albeit smaller. Femoral and abdominal subcutaneous adipose tissue compartments were unaffected by disease and nutritional strategy.

CONCLUSIONS

Early parenteral nutrition did not prevent the pronounced wasting of skeletal muscle observed over the first week of critical illness. Furthermore, early parenteral nutrition increased the amount of adipose tissue within the muscle compartments.

Gait and participation outcomes in adults with cerebral palsy: a series of case studies using mixed methods

BACKGROUND

There is a paucity of information on long-term outcomes of adults with cerebral palsy (CP) who received orthopedic interventions in childhood. Clinical effectiveness research requires assessment of outcomes that account for personal and environmental factors that may mediate the effects of treatment, in addition to body structures & function, activity, and participation.

OBJECTIVE/HYPOTHESIS

The purpose of this study is to provide a descriptive analysis of characteristics associated with gait and participation outcomes in a series of case studies of adults with CP.

METHODS

Participants had follow up gait analysis and clinical evaluation in adulthood and assessment of outcomes with the FIM instrument, the SF-36 Health survey, the Canadian Occupational Performance Measure, and semi-structured questions.

RESULTS

Twenty-two out of 26 participants (mean age = 25 years; GMFCS level I (n = 9); II (n = 3); III (n = 11); IV (n = 3)) maintained or improved childhood gait abilities, with levels of participation in society similar to age matched peers. Higher level of severity and personal choices impacted gait abilities in the four who declined. Majority of participants lost range of motion in hip flexion and knee extension, had pain, reported a fitness program, and increased in weight status. Personal factors and environmental factors played a role in both gait and participation outcomes.

CONCLUSION

Promotion of fitness activities and social advocacy are warranted for adults with CP. Clinical effectiveness research of long-term impact of orthopedic interventions should account for treatment effects on body structures & function, activity, participation, and modifying effects of personal, and environmental factors.

Health consequences associated with being overweight or obese: a Swedish population-based study of 85-year-olds

OBJECTIVES

To determine whether being overweight or obese is associated with significant health outcomes in an 85-year-old population.

DESIGN

A cross-sectional population-based study.

SETTING

Linköping, Sweden.

PARTICIPANTS

Three hundred thirty-eight people born in 1922 were identified using the local authority's register.

MEASUREMENTS

Data related to sociodemographic characteristics, health-related quality of life (HRQoL), assistance use, and the presence of diseases were collected using a postal questionnaire. Anthropometry and functional status were assessed during home and geriatric clinic visits. Diseases were double-checked in the electronic medical records, and information about health service consumption was obtained from the local healthcare register.

RESULTS

Overweight (body mass index (BMI) 25.0-29.9 kg/m(2)) and obese (BMI ≥ 30.0 kg/m(2)) participants perceived more difficulty performing instrumental activities of daily living (IADLs) and had more comorbidity than their normal-weight counterparts (BMI 18.5-24.9 kg/m(2)), but their overall HRQoL and health service costs did not differ from those of normal-weight participants. After controlling for sociodemographic factors, being overweight did not influence IADLs or any comorbidity, but obese participants were more likely to perceive greater difficulty in performing outdoor activities (odds ratio (OR) = 2.1, 95% confidence interval (CI) = 1.1-4) and cleaning (OR = 2.2, 95% CI = 1.2-4.2) than their normal-weight counterparts. Although obesity was also associated with multimorbidity (OR = 3, 95% CI = 1.2-8), the health service cost of each case of multimorbidity (n = 251) was highest in normal-weight participants and nearly three times as much as in obese participants (ratio: 2.9, 95% CI = 1.1-8.1).

CONCLUSION

For 85-year-olds, being obese, as opposed to overweight, is associated with self-reported activity limitations and comorbidities. Overweight older adults living in their own homes in this population had well-being similar to that of those with normal weight.

Self-concept of adults with cerebral palsy

PURPOSE

To describe the self-concept of adults with cerebral palsy (CP).

METHOD

Cross-sectional design included the Tennessee Self-Concept Scale, version 2 (TSCS:2), Functional Independence Measure (FIM™), Beck Depression Index II (BDI®-II), Craig Hospital Inventory of Environmental Factors (CHIEF), Diener's Satisfaction with Life Scale (SWLS), Gross Motor Functional Classification System (GMFCS) levels and demographic questions.

RESULTS

One hundred and two people with CP (52 females, mean age=26) participated. Thirty-eight participants had unreliable answers as indicated by validity scales and were excluded from the analysis. Ten participants had high self-concept; 41 had average self-concept and 13 had low total self-concept. Self-concept had a fair and inverse association with the BDI-II (Pearson's r= -0.3, p<0.01) and a moderate and direct association with the SWLS (Pearson's r=0.4, p<0.001). Self-concept was not associated with GMFCS level or FIM score. Family and Personal sub-domain scores were lowest sub-domain scores for people with low self-concept (p<0.01).

CONCLUSION

The majority of the participants in this sample had a healthy self-concept; and self-concept was not associated with severity of CP, but with lack of depression and life satisfaction. Results suggest the need for family centred care into adulthood.

Descriptions of functioning and health and relations to a gross motor classification in adults with cerebral palsy

PURPOSE

The aim of this study was to describe functioning and health, and explore the use of the Gross Motor Function Classification System (GMFCS) in an adult population with cerebral palsy (CP).

METHODS

From a cohort of 199 persons, 48 persons were selected for structured interviews and functional assessments regarding activities of daily living, motor function, range of motion, pain and general health.

RESULTS

A third of the population had deteriorated in function from adolescence to adulthood according to the GMFCS. The majority were independent in personal ADL, but many of those were dependent in instrumental ADL. Motor function scores reflected problems in walking ability, and limited ROM and pain were common in all functional levels. General health was lower than in a general population. GMFCS seems valid for classifying adults with CP since it is correlated with instruments measuring motor function and ADL in terms of dependence.

CONCLUSION

Decreased functional ability and secondary musculoskeletal problems are common in adults with CP and general health can be associated with those problems. It is important to further explore health aspects and relations between health status and self-perceived health. The GMFCS is a useful tool, especially for comparisons throughout the life span, but in order to use in an adult population further development is needed.

Everyday physical activity and community participation of adults with hemiplegic Cerebral Palsy

PURPOSE

To assess the level and potential determinants of everyday physical activity and participation in various life areas of adults with hemiplegic cerebral palsy (CP) in comparison with healthy subjects.

METHOD

In a cross-sectional study everyday physical activity was measured (Activity Monitor) in 16 adults with CP, aged 28 (3) years, and 16 age/gender matched healthy volunteers, aged 29 (3) years. Participation was assessed by means of validated questionnaires. Age, gender, body fat (skinfold thickness), muscle tone (Ashworth Scale), functional level and participation were assessed as potential determinants of everyday physical activity.

RESULTS

In adults with CP mean (SD) duration of dynamic activities during a day (10.6 [3.5]%) was comparable to healthy subjects (11.2 4%) (p = 0.66). In most life areas the level of participation was comparable for both groups, although adults with CP spent more time on non-intensive leisure activities. Participation in sports appeared to be a determinant of everyday physical activity in both groups.

CONCLUSIONS

The results indicate that the levels of everyday physical activity and community participation in adults with hemiplegic CP are comparable to levels in healthy comparison subjects.

Cognitive functioning of adolescents and young adults with meningomyelocele and level of everyday physical activity

PURPOSE

To explore whether cognitive functioning in patients with meningomyelocele (MMC) is related to level of everyday physical activity.

METHOD

In a cross-sectional study in 14 patients with MMC (aged 14 - 26 years) a neuropsychological test battery was administered to each patient. Everyday physical activity of the patients was measured with an accelerometry-based Activity Monitor (AM), and compared to 14 healthy comparison subjects.

RESULTS

Intellectual ability of 10 patients was in the normal range. For memory and verbal learning, executive functioning, divided attention and reaction speed subnormal scores were present in six or more patients. Time spent on dynamic activities was low in patients with MMC as compared to healthy subjects. After controlling for intellectual ability, we found that in patients with MMC (i) executive functioning was positively related, and (ii) word production was negatively related to everyday physical activity.

CONCLUSION

We found some indication that specific impairments in executive functioning might be related to everyday physical activity of adolescents and young adults with MMC.

Activity limitations in personal, domestic and vocational tasks: a study of adults with inborn and early acquired mobility disorders

PURPOSE

To compare activity limitations at the workplace with those in the home situation.

SUBJECTS AND METHODS

Sixty-nine subjects, 22-49 years of age, with inborn or early acquired mobility disorders and with experience of vocational employment were studied. They were interviewed to assess their level of dependence according to the Functional Independence Measure (FIM) and Instrumental Activity Measure (IAM) and in 22 vocation-related items. Rasch analysis was perfomed in order to assess the relative difficulty of the items. In the vocational items the subjects rated perceived difficulty on a 4-level scale. Satisfaction in one general and six domain-specific areas was rated on a 6-level scale.

RESULTS

Forty-six per cent of the subjects were dependent in one or several FIM items, 90% in IAM items and 38% in the vocation-related items. In 15 of these items great difficulty was reported by few subjects. Collapsing the 7-category scale for dependence to four categories gave the best Rasch model. Most of the IAM items were the hardest to manage without assistance. FIM social-cognitive and cognitive vocation-related items were the easiest items. Most subjects were satisfied in the general and domain-specific areas.

CONCLUSIONS

Activities related to household tasks and transportation demonstrated the highest level of dependence, whereas it was easier to acquire independence in most vocation-related tasks.

Dependence in daily activities and life satisfaction in adult subjects with cerebral palsy or spina bifida: A follow-up study

PURPOSE

To study dependence in daily activities in adults with congenital disorders living in the community by interviewing them with an interval of 5 years.

SUBJECTS AND METHODS

Thirty-one subjects (20 men, 11 women) aged 24-43 years at the second assessment. Twenty-two subjects had cerebral palsy, and nine had spina bifida. Interviews in the subjects' homes were conducted using Functional Independence Measure (FIM), Instrumental Activity Measure (IAM), and a questionnaire concerning life satisfaction. Rasch analysis was used for joint calibration of physical FIM- and IAM-items to obtain measure values (logits) for items and persons.

RESULTS

Most subjects were independent in FIM items, but usually dependent in IAM items, except Mobility outdoors and Simple meal. The level of dependence increased significantly between the two assessments for four self-care items in FIM, Stairs and all IAM items except Mobility outdoors and Cleaning. For 13 subjects the overall level of dependence increased significantly for self-care between the two assessments. Most subjects were satisfied in life in general, but satisfaction in self-care ADL decreased between the two assessments.

CONCLUSIONS

The increased dependence in daily activities demonstrated may reflect reduced capacity but also changes in preferences and interests as well as the social situation.

Evaluation of a 5-level Functional Independence Measure in a longitudinal study of elderly stroke survivors

PURPOSE

The aim of the present study was to evaluate a modified 5-level Functional Independence Measure (FIM), by using the assessments from a longitudinal study of elderly stroke survivors.

METHOD

One hundred and seventy-three patients were followed longitudinally. Firstly, the 7-level FIM was used at 0-3 days, 3 weeks, and 3 months and then after 1 year following acute stroke. The data, in total 8996 assessments, were presented on the item level. Secondly, the data were recoded with the help of a modified 5-level FIM according to the cut-off levels suggested in a previous study of the same target group. Two registered occupational therapists did the assessments in the patients' natural environment, i.e., in their own homes or in different kinds of assisted living. The data were obtained both by interviews and with the help observations, when the occupational therapist asked the patients to perform specific activities.

RESULTS

The assessments on all four occasions were found to polarise when using the 7-level FIM, and the intermediate levels of assistance were more seldom used. After the assessment data were recoded with the modified 5-level FIM, it was shown that it was easier to follow the process of activity by using an instrument with fewer levels. A modified 5-level FIM had enough levels to ensure sensitivity and was easier to handle when evaluating performance of daily activities in a large population study.

CONCLUSIONS

A modified 5-level FIM can be useful in large population studies and most likely increase reliability without losing in sensitivity.

Agreement in activities of daily living performance after stroke in a postal questionnaire and interview of community-living persons

OBJECTIVE

To compare assessments of activities of daily living (ADL) made in a postal questionnaire and an interview.

DESIGN

Comparative study of a convenience sample.

SUBJECTS

Results in 36 persons with stroke >10 years previously.

METHODS

Data on ADL were gathered in a self-administered postal questionnaire followed by a semi-structured interview (within 1-2 weeks) using items in the Functional Independence Measure, combined with instrumental items, Instrumental Activity Measure or the ADL taxonomy (personal and instrumental items).

RESULTS

There was generally moderate to good agreement between the postal questionnaire and the interview. Other dependence identified was reported during the interviews. Although the operational descriptions of the items varied between the ADL indices, they primarily identified ADL independence in the same persons.

CONCLUSION

The use of a self administrated postal ADL questionnaire was feasible for studying ADL performance. However, in some persons, interviews may be needed to complement the results.

Subjective well-being and satisfaction with life in adults with spastic cerebral palsy: a pilot study of a randomized sample

The aim of this study was to explore subjective well-being and satisfaction with life in general and with participation, activities, and health, in adults with cerebral palsy (CP). A randomized sample of 50 individuals was drawn from a sample of 465 previous outpatients of a regional social paediatric centre in southern Germany. A psychological measure for well-being (Bern Questionnaire on Subjective Well-Being, adult form [BSW/A]) and a sociomedical measure (Life Satisfaction Checklist [LiSat-11]) were applied as outcome measures. Twenty-five individuals from 35 responders (nine males, 16 females; mean age 28y, SD 2y 7mo, range 25-33y) were evaluated completely. Nineteen participants had bilateral and six had unilateral spastic types of CP (Gross Motor Function Classification System Levels I n=5, II n=5, III n=5, IV n=8, and V n=2). Eighteen individuals had no or only minor intellectual disabilities. Subjective well-being and general satisfaction with life were not impaired in adults with CP. Joy of life (a subscale of the BSW/A) was even increased. Satisfaction with some areas of participation was reduced compared with a reference and clinical samples from Sweden. In conclusion, subjective well-being and general satisfaction with life are not decreased in adults with CP. The different levels of satisfaction with areas of participation in German and Swedish individuals with CP may be explained by differences of social inclusion.

Home rehabilitation after hip fracture. A randomized controlled study on balance confidence, physical function and everyday activities

Objective: To investigate whether home rehabilitation can improve balance confidence, physical function and daily activity level compared to conventional care in the early phase after hip fracture.

Design: A randomized controlled study.

Setting: Geriatric rehabilitation clinic.

Subjects: One hundred and two community-dwelling elderly people.

Interventions: A geriatric, multiprofessional home rehabilitation programme focused on supported discharge, independence in daily activities, and enhancing physical activity and confidence in performing daily activities was compared with conventional care in which no structured rehabilitation after discharge was included.

Main measures: Falls efficacy, degree of dependency and frequency in daily activities, habitual physical activity and basic functional performance.

Results: When comparing status one month after discharge with baseline, the home rehabilitation group showed a higher degree of recovery in self-care (P<0.0001), mobility (P = 0.002), locomotion (P = 0.0036) and domestic activities (P = 0.0098), as well as larger increase in balance confidence on stairs (P = 0.0018) and instrumental activities (mean increase home rehabilitation 19.7 and conventional care 7.1, P<0.0001) compared with the conventional care group. At one month, a majority of the home rehabilitation participants (88%) took outdoor walks, compared with less than half (46%) of the conventional care group (P<0.001) and were also more independent in outdoor activities (P = 0.0014).

Conclusions: This study indicates that home rehabilitation, focused on supported discharge and enhancing self-efficacy, improves balance confidence, independence and physical activity in community-dwelling older adults in the early phase after hip fracture.

Evaluating asthma control: a comparison of measures using an item response theory approach

Self-reported symptoms, FEV(1), and clinician judgment are all used to evaluate asthma control. The relative utility of each measure of control cannot be easily assessed. Item response theory (IRT) approaches allow for the direct comparison of the utility of different types of measures used to assess control. The objective of this study was to evaluate the validity and reliability of evaluating asthma control using symptom, clinical, and physiologic measures by applying an IRT approach. Subjects receiving care at an asthma clinic were evaluated on measures of asthma control. Based on 114 evaluations, IRT parameters were estimated to evaluate whether measures assessed a single underlying construct, the hierarchical relationship between the measures and the level of control each measure assessed, whether measures targeted all levels of asthma control, and whether the scoring categories distinguished between different levels of control. Infit statistics (0.74-1.5) for individual items showed that all items fit the underlying concept of asthma control. The reproducibility of the hierarchal scale was high (0.9). The results also demonstrated that items differentiated two strata (high, low) of control. The gaps in the hierarchal scale showed that for many subjects (37%) there were no items at their level of asthma control. The IRT approach identified gaps in current measurement that need to be addressed to provide more precise evaluations of control required to accurately monitor changes in patient status.

Circuit training in community-living "younger" men after stroke

OBJECTIVES

We sought to assess a training program focused on muscle strength and endurance in persons with prior stroke.

METHODS

Thirty men with a slight hemiparesis caused by a first occurrence of stroke at least 6 months earlier were included with an average age of 54 years. The following was assessed before and after an 8-week period: muscle strength, endurance, work capacity, and activity level. The training group consisted of 21 persons and 9 served as control subjects. There were no differences between the groups in the various assessments from the start. The training was set up as circuit training with 5 stations aiming to strengthen the muscles and increase endurance in the bilateral lower limbs. The session lasted for 45 minutes, 3 times per week, for 8 weeks. On eligible persons in the training group, double-sided muscle biopsies were also performed before and after.

RESULTS

There was significance in improved muscle strength and improved peak oxygen uptake for the paretic leg, which was reflected in the muscle enzymes. The nonparetic side also showed improvement, but to a lesser extent. The control group remained unchanged.

CONCLUSIONS

Stroke survivors can improve muscle strength, endurance, and work capacity in both the paretic and nonparetic leg with a circuit training program.

Cross-diagnostic validity in a generic instrument: an example from the Functional Independence Measure in Scandinavia

Background

To analyse the cross-diagnostic validity of the Functional Independence Measure (FIM™) motor items in patients with spinal cord injury, stroke and traumatic brain injury and the comparability of summed scores between these diagnoses.

Methods

Data from 471 patients on FIM™ motor items at admission (stroke 157, spinal cord injury 157 and traumatic brain injury 157), age range 11–90 years and 70 % male in nine rehabilitation facilities in Scandinavia, were fitted to the Rasch model. A detailed analysis of scoring functions of the seven categories of the FIM™ motor items was made prior to testing fit to the model. Categories were re-scored where necessary. Fit to the model was assessed initially within diagnosis and then in the pooled data. Analysis of Differential Item Functioning (DIF) was undertaken in the pooled data for the FIM™ motor scale. Comparability of sum scores between diagnoses was tested by Test Equating.

Results

The present seven category scoring system for the FIM™ motor items was found to be invalid, necessitating extensive rescoring. Despite rescoring, the item-trait interaction fit statistic was significant and two individual items showed misfit to the model, Eating and Bladder management. DIF was also found for Spinal Cord Injury, compared with the other two diagnoses. After adjustment, it was possible to make appropriate comparisons of sum scores between the three diagnoses.

Conclusion

The seven-category response function is a problem for the FIM™ instrument, and a reduction of responses might increase the validity of the instrument. Likewise, the removal of items that do not fit the underlying trait would improve the validity of the scale in these groups. Cross-diagnostic DIF is also a problem but for clinical use sum scores on group data in a generic instrument such as the FIM™ can be compared with appropriate adjustments. Thus, when planning interventions (group or individual), developing rehabilitation programs or comparing patient achievements in individual items, cross-diagnostic DIF must be taken into account.

Functional independence among young adults with spina bifida, in relation to hydrocephalus and level of lesion

Knowledge about the level of functional independence that can be expected in adulthood might support decisions on the treatment of newborn infants with spina bifida. This study determined functional independence among young adults with spina bifida and its relationships with pathological characteristics known from birth (hydrocephalus and level of lesion). Data were collected from medical records and by physical examination. Functional independence was assessed on six domains (self-care, sphincter control, transfers, locomotion, communication, and social cognition) using the Functional Independence Measure (FIM). Participants were 165 patients with spina bifida (69 males, 96 females; age range 16 to 25y, mean 20y 9mo [SD 2.9]; 117 with hydrocephalus). Patients without hydrocephalus were independent for all FIM domains except sphincter control, as were patients with hydrocephalus with a lesion level below L2. Most patients with hydrocephalus and a lesion at L2 or above were dependent as regards sphincter control (98%), locomotion (79%), and self-care (54%), and quite a few needed support in transfers (38%), social cognition (29%), and communication (15%).

The first year after successful cardiac resuscitation:

AIM

To assess cognitive function, activities of daily living (ADL) and living situation longitudinally up to 1 year after cardiac arrest.

SETTING

University hospital.

MATERIALS

The study continued for 3 years and consecutive patients (18-75 years of age) who survived resuscitation were included.

METHOD

A longitudinal study with examinations using the National Institute of Health Stroke Scale for assessing brain damage, along with the Mini Mental State Examination. To assess ADL, we used the Functional Independence Measure and the Instrumental Activity Measure. Life satisfaction was assessed, together with health-related quality of life. Social status and vocational status were recorded.

RESULTS

Mortality was high during the first 90 days (31%). After discharge, not much improvement was seen in cognitive function. This was reflected in reduced dependency in ADL. Work capacity at 1 year was only 13%. The health related quality of life showed great improvement during the first year, being almost the same as for Swedish reference values.

CONCLUSIONS

Most of the improvement resulting in the independence of ADL occurred during the first 45 days. It is important to give the next of kin information about the patient's progress and need for assistance in order to enable them to plan for the future before discharge.

Scoring alternatives for FIM in neurological disorders applying Rasch analysis

OBJECTIVE

The Functional Independence Measure (FIM) is an internationally widely used outcome measure. The aim of this study was to evaluate the structural properties of FIM using the Rasch model, with regard to scoring within rehabilitation centres in Scandinavia.

MATERIALS AND METHODS

FIM data from 1660 patients with stroke, traumatic brain injury and spinal cord injury were analysed. The best models with respect to person separation were determined, together with person reliability, item separation, disordered categories, distance of more than 1.4 logits between categories and item fit to the model.

RESULTS

Analysis showed disordering using seven categories in all three diagnoses. After collapsing of categories a four-category scale was the best solution.

CONCLUSIONS

Decreasing the categories from seven to four may be one way of dealing with problems of disordered thresholds. Further studies are also needed in order to try the suggested scale in clinical settings and to compare it with the original FIM scale.

The effects of endurance training in persons with a hereditary myosin myopathy

OBJECTIVE

To evaluate muscle performance and its consequences in eight individuals with a hereditary myopathy and the effects of an 8-week endurance training program.

MATERIAL AND METHODS

Handgrip, muscle strength and endurance and oxygen consumption by breath-by-breath analysis during a stepless bicycle ergonometer test were evaluated. Walking, balance test and activities of daily living (ADL) were assessed, and a questionnaire for activity level and perceived symptoms was used. The design was a before-after trial in comparison with data from a control population, bicycling at 70% of maximal workload, 30 min/day, 5 days/week for 8 weeks.

RESULTS

The subjects were weaker than age-matched controls. After training, the peak watt increased by almost 20% (P < 0.05). Muscle strength (flexion/extension) and isometric endurance (40% of maximum at 60 degrees ) did not change significantly. The average self-selected walking speed increased significantly (P < 0.05) from 1.25 to 1.45 m/s. Compliance was excellent and no serious adverse events occurred.

CONCLUSION

Endurance training seems to function for this myopathy.

Short-form activity measure for post-acute care

OBJECTIVE

To develop a comprehensive set of short forms using item response theory (IRT) and item pooling procedures for the purpose of monitoring postacute care functional recovery.

DESIGN

Prospective study.

SETTING

Six postacute health care networks in the greater Boston area, including inpatient acute rehabilitation, transitional care units, home care, and outpatient services.

PARTICIPANTS

A convenience sample of 485 adult volunteers who were currently receiving skilled rehabilitation services.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

We developed a set of 6 short forms across 3 activity domains from new items and items from existing postacute care instruments.

RESULTS

Inpatient- and community-based short forms were developed for each of 3 activity domains: physical & movement, applied cognition, and personal care & instrumental. Items were selected for inclusion on the short forms to maximize content coverage and information value of items across the range of content and to minimize ceiling and floor effects. We were able to match the distribution of sample scores with very good item precision for 1 of the constructs (physical & movement); the other 2 domains (personal care & instrumental, applied cognition) were more challenging because of the variability in patient recovery and ceiling effects.

CONCLUSIONS

ITR methods and item pooling procedures were valuable in developing paired sets of short-form instruments for inpatient and community rehabilitation that provided estimates of functioning along a common metric for use across postacute care settings.

Refining the conceptual basis for rehabilitation outcome measurement: personal care and instrumental activities domain

BACKGROUND

Rehabilitation outcome measures routinely include content on performance of daily activities; however, the conceptual basis for item selection is rarely specified. These instruments differ significantly in format, number, and specificity of daily activity items and in the measurement dimensions and type of scale used to specify levels of performance. We propose that a requirement for upper limb and hand skills underlies many activities of daily living (ADL) and instrumental activities of daily living (IADL) items in current instruments, and that items selected based on this definition can be placed along a single functional continuum.

OBJECTIVE

To examine the dimensional structure and content coverage of a Personal Care and Instrumental Activities item set and to examine the comparability of items from existing instruments and a set of new items as measures of this domain.

METHODS

Participants (N = 477) from 3 different disability groups and 4 settings representing the continuum of postacute rehabilitation care were administered the newly developed Activity Measure for Post-Acute Care (AM-PAC), the SF-8, and an additional setting-specific measure: FIM (in-patient rehabilitation); MDS (skilled nursing facility); MDS-PAC (postacute settings); OASIS (home care); or PF-10 (outpatient clinic). Rasch (partial-credit model) analyses were conducted on a set of 62 items covering the Personal Care and Instrumental domain to examine item fit, item functioning, and category difficulty estimates and unidimensionality.

RESULTS

After removing 6 misfitting items, the remaining 56 items fit acceptably along the hypothesized continuum. Analyses yielded different difficulty estimates for the maximum score (eg, "Independent performance") for items with comparable content from different instruments. Items showed little differential item functioning across age, diagnosis, or severity groups, and 92% of the participants fit the model.

CONCLUSIONS

ADL and IADL items from existing rehabilitation outcomes instruments that depend on skilled upper limb and hand use can be located along a single continuum, along with the new personal care and instrumental items of the AM-PAC addressing gaps in content. Results support the validity of the proposed definition of the Personal Care and Instrumental Activities dimension of function as a guide for future development of rehabilitation outcome instruments, such as linked, setting-specific short forms and computerized adaptive testing approaches.

Rasch analysis of a new stroke-specific outcome scale: the Stroke Impact Scale

OBJECTIVES

To assess multiple psychometric characteristics of a new stroke outcome measure, the Stroke Impact Scale (SIS), using Rasch analysis, and to identify and remove misfitting items from the 8 domains that comprise the SIS.

DESIGN

Secondary analysis of 3-month outcomes for the Glycine Antagonist in Neuroprotection (GAIN) Americas randomized stroke trial.

SETTING

A multicenter randomized trial performed in 132 centers in the United States and Canada.

PARTICIPANTS

A total of 696 individuals with stroke who were community-dwelling and independent prior to acute stroke.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Rasch analysis was performed using WINSTEPS, version 3.31, to evaluate 4 psychometric characteristics of the SIS: (1) unidimensionality or fit (the extent to which items measure a single construct), (2) targeting (the extent to which the items are of appropriate difficulty for the sample), (3) item difficulty (the ordering of items from least to most difficult to perform), and (4) separation (the extent to which the items distinguish distinct levels of functioning within the sample).

RESULTS

(1) Within each domain, most of the items measured a single construct. Only 3 items misfit the constructs and were deleted ("add and subtract numbers," "get up from a chair," "feel emotionally connected") and 2 items ("handle money," "manage money") misfit the combined physical domain. These items were deleted to create SIS, version 3.0. (2) Overall, the items are well targeted to the sample. The physical and participation domains have a wide range of items that capture difficulties that most individuals with stroke experience in physical and role functions, while the memory, emotion, and communication domains include items that capture limitations in the most impaired patients. (3) The order of items from less to more difficult was clinically meaningful. (4) The individual physical domains differentiated at least 3 (high, average, low) levels of functioning and the composite physical domain differentiated more than 4 levels of functioning. However, because difficulties with communication, memory, and emotion were not as frequently reported and difficulties with hand function were more frequently reported, these domains only differentiated 2 (high, low) to 3 (high, average, low) strata of patients. Time from stroke onset to administration of the SIS had little effect on item functioning.

CONCLUSION

Rasch analysis further established the validity of the SIS. The domains are unidimensional, the items have an excellent range of difficulty, and the domain scores differentiated patients into multiple strata. The activities of daily living/instrumental activities of daily living, mobility, strength, composite physical, and participation domains have the most robust psychometric characteristics. The composite physical domain is most able to discriminate difficulty in function in individuals after stroke, while the communication, memory, and emotion domain items only capture limitations in function in the more impaired groups of patients.

Disease activity score for children with juvenile dermatomyositis: reliability and validity evidence

OBJECTIVE

To assess the reliability and validity of the Disease Activity Score (DAS), an instrument used to evaluate children with juvenile dermatomyositis (JDM).

METHODS

Psychometric study of internal consistency, reliability, rater agreement, and the relationship with measures of muscle strength and disability was conducted.

RESULTS

The DAS ratings are internally consistent (reliability = 0.89) and describe a wide range of disease activity. The pediatric rheumatologists in this study agree on the presence of most of the disease indicators. Their disagreements tend to cancel each other, resulting in highly correlated (r = 0.79) overall measures across raters. Estimates of muscle weakness using the DAS and ratings of muscle strength obtained independently from therapists are highly related (r = -0.77), but estimates of disease activity and disability are weakly related (r = 0.20).

CONCLUSION

The DAS exhibits evidence of good reliability and validity. The combination of skin and muscle strength assessments makes this easily administered instrument a useful addition in the evaluation of children with JDM.

The self-reported functional measure: Predictive validity for health care utilization in multiple sclerosis and spinal cord injury

OBJECTIVE

To examine the predictive validity of the Self-Reported Functional Measure (SRFM), a new measure derived from the FIMtrade mark instrument, for health care utilization in multiple sclerosis (MS) and spinal cord injury (SCI).

DESIGN

Prospective cohort study using a mailed survey in 1995 and administrative records from 1996 and 1997.

SETTING

Veterans Health Administration hospitals and outpatient clinics.

PATIENTS

A total of 6361 veterans with SCI and 1789 veterans with MS.

MAIN OUTCOME MEASURES

SRFM score was compared with subsequent outpatient visits, hospitalizations, hospital lengths of stay (LOSs), and residence peri-hospitalization. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated for these variables.

RESULTS

A total of 3836 subjects (47.6%) were hospitalized during 1996-1997, and all but 874 (10.7%) had 1 or more outpatient visits. SRFM score predicted inpatient, but not outpatient health care utilization. Persons in the lowest SRFM quartile were over 90% (OR = 1.91, 95% CI = 1.71-2.13) more likely to be hospitalized compared with those in the highest SRFM quartile; also, they were over 2 times (OR = 2.18, 95% CI = 1.85-2.57) more likely to have a LOS greater than 7 days, were over 2 times (OR = 2.41, 95% CI = 1.62-3.58) more likely to die in hospital, and were nearly 3 times (OR = 2.86, 95% CI = 2.00-4.08) more likely to be discharged to an institution.

CONCLUSIONS

SRFM had excellent predictive validity for hospitalization, LOS, and discharge destination among patients with MS or SCI.

Functional level of young adults with cerebral palsy

OBJECTIVE

To acquire insight into the level of functioning of young adults with cerebral palsy (CP).

DESIGN

Descriptive cross-sectional study.

SETTING

Rehabilitation Centre Den Haag, The Netherlands.

METHOD

A structured questionnaire, including the Barthel Index was mailed to 134 young adults (aged 21-31 years) with cerebral palsy.

RESULTS

Eighty subjects responded (60%). Of these, 60 (75%) were largely or fully independent in activities of daily living, 72 (90%) moved independently indoors, 56 (70%) outdoors. In 67 (77.5%) of the group the level of communication was adequate for telephone conversation. Twenty-four (30%) lived with their parents, 10 (12.5%) with a partner and 26 (32.5%) lived alone. Almost half lived in an unadapted house. Forty-two (53%) completed some form of secondary education and 29 (36.3%) had paid employment.

CONCLUSION

Despite their considerable impairments, the large majority of this group of young adults with cerebral palsy are independent in activities of daily living, mobility and communication. Regarding the level of education, participation in paid employment and sports activities, however, young adults with CP are poorly integrated.

Equating health status measures with item response theory: illustrations with functional status items

BACKGROUND

More than 75 instruments have been developed to measure functional status. These measures differ in number of items, type of rating scale, and item difficulty. Such variations render it impossible to compare data across different measures. One way to overcome such test dependency is test equating, which relates scores from different measures to a common metric.

OBJECTIVE

We developed a bank of physical functioning items and equated them using item response theory.

DESIGN

We used a common-item equating design and a self-administered survey of functional status.

SUBJECTS

Individuals > or = 65 years of age who had > or = 1 ambulatory visit across a 3-month sampling frame to a Veterans Administration Medical Center or its affiliated university medical center.

RESULTS

The dressing items were the most discriminating, followed by bathing, toileting, mobility, cooking/eating, and household and community activities. The 5 most discriminating items were to put underclothes on, manage clothes after toileting, move between rooms, take pants/slacks off, and get into bed. Most of the items were located on the easier end of the ability continuum. Only 6 would classify as being very difficult.

CONCLUSIONS

We used item response theory to equate and calibrate a large number of activities of daily living on the same scale; by doing so, we were able to better understand the structure and order of domain-specific items to each other, as well as the interrelations among items across the ability continuum.

Application of a disease-specific, quality-of-life measure (QoL-AGHDA) in growth hormone-deficient adults and a random population sample in Sweden: validation of the measure by rasch analysis

OBJECTIVE

Growth hormone deficiency (GHD) in adults has been associated with impaired health status and quality of life (QoL) in several studies using generic measures, and in a few studies using recently developed disease-specific measures. Theoretically, disease-specific measures may be more sensitive and succinct than generic measures, and hence prove convenient for general use in clinical practice. The present study sought to validate the scaling properties of the disease-specific QoL-AGHDA measure through the implementation of Rasch analysis. The study also sought to compare, by using the QoL-AGHDA, the QoL of a relatively large Swedish cohort of adults with untreated GHD with that of a reference population also from Sweden.

PATIENTS

The QoL of 111 adults with untreated GHD from Stockholm and Göteborg was compared with that of 1448 adult subjects randomly selected from the population of Göteborg.

MEASUREMENTS

The scaling properties of the QoL-AGHDA were assessed by investigating its fit to a dichotomous Rasch model. Rasch-transformed QoL scores from the QoL-AGHDA questionnaire were stratified by age and gender, and 95% confidence intervals were calculated.

RESULTS

Rasch analysis of the QoL-AGHDA indicated the measure to be robust in terms of its unidimensionality and ordering properties, and lack of differential item functioning. The raw scores produced by the QoL-AGHDA are at the ordinal level. Non-overlapping 95% confidence intervals of Rasch-transformed interval scores in most age categories indicated that men and women with GHD had significantly lower QoL than the reference population.

CONCLUSION

The Swedish QoL-AGHDA has good scaling properties, and hence can be considered a robust measure. It is suitable for assessing quality of life in adults with GH deficiency, and for making comparisons with adults who are not growth hormone deficient. Adult GH deficiency is associated with a significant impairment in QoL.

Rasch analysis of the Western Ontario MacMaster questionnaire (WOMAC) in 2205 patients with osteoarthritis, rheumatoid arthritis, and fibromyalgia

OBJECTIVE

Advances in health measurement have led to the application of Rasch Item Response Theory (IRT) analysis (Rasch analysis) to evaluate instruments measuring health status and quality of life of patients, including the Health Assessment Questionnaire and SF-36. This study investigated the extent to which the Western Ontario MacMaster osteoarthritis questionnaire (WOMAC) satisfies the Rasch model, particularly in respect to unidimensionality, item separation, and linearity.

METHODS

The study included a total of 2205 patients, 1013 with rheumatoid arthritis (RA), 655 with osteoarthritis of the knee or hip (OA), and 537 with fibromyalgia. All patients completed the WOMAC as part of a longitudinal study of rheumatic disease outcomes. To examine whether the WOMAC pain and function scales each fits the Rasch model, the Winsteps program was used to assess item difficulty, scale unidimensionality, item separation, and linearity.

RESULTS

Although the WOMAC worked best in OA, regardless of disorder, both the pain and function scales were unidimensional, had adequate item separation, and had a long range (25-150) of linearity in the function scale. Several functional items, however, had a high information weight fit (INFIT) statistic, indicating poor fit to the model. These items included "getting in and out of the bath" and "going down stairs."

CONCLUSION

The WOMAC generally satisfies the requirements of Rasch item response theory across all disorders studied, and is an appropriate measure of lower body function in OA, RA and fibromyalgia. Although some individual items do not fit well, it is not likely that removing such items would result in more than overall minimal differences, and it will be difficult to remove traces of multidimensionality while keeping the central constructs of progressive lower body musculoskeletal abnormality intact. In addition, it is possible that a "purer", still more unidimensional instrument would be less useful in clinical trials and epidemiological studies by restricting the range of the scale.

Development of multi-disciplinary team I-ADL assessment in community health care: an interrater reliability study of the measure of instrumental daily activity

This paper describes a development process concerning the active involvement of staff of different professions in developing and implementing methods for assessment of activities of daily living (ADL) in home-based geriatric rehabilitation. Although a variety of established ADL instruments exist, at the time for this study no I-ADL (Instrumental Activities of Daily Living) instrument suitable for communication among staff members of different professions was available. The specific aim was to test a new I-ADL instrument for interrater reliability. The developmental process resulting in the Measure of Instrumental Daily Activity (MIDA) is described. The instrument comprises 12 I-ADL items, defined on the basis of practical home rehabilitation experience. The study involved 36 clients with impairments, aged 65+ years. Multi-disciplinary interrater reliability was tested by 67 parallel independent assessments during a 3-month period, performed by pairs of raters of different professions. Overall agreement was very good (mean weighted kappa=0.89). The MIDA fulfils the basic requirements necessary for valid I-ADL assessment of elderly clients in community health care. An important quality is the active involvement of all staff in the assessment procedure, facilitating and stimulating the implementation of a general rehabilitative attitude in everyday practice.

The validity in persons with spinal cord injury of a self-reported functional measure derived from the functional independence measure

STUDY DESIGN

A cross-sectional, mailed survey on impairment and function using 6361 respondents to the Spinal Cord Dysfunction National Veterans Survey who reported spinal cord injury as the sole cause of their spinal cord dysfunction.

OBJECTIVES

To establish the concurrent and construct validities of a Self-Reported Functional Measure appropriate for use in patients with spinal cord injuries.

SUMMARY OF BACKGROUND DATA

Functional assessment is of increasing importance in clinical care, quality assurance, and national health-care planning. There is a conspicuous need for validated functional assessment measures that are rapid, reliable, and appropriate for use in the disabled population.

METHODS

The correlation was examined of hours of personal assistance, number of affected limbs, amount of motor impairment, and amount of combined limb-motor impairment to Self-Reported Functional Measure response tertile (scores, 13-32, 33-45, 46-52; lower scores indicated worse function).

RESULTS

There were statistically significant correlations between Self-Reported Functional Measure score and hours of personal assistance (P < 0.001), the number of affected limbs (P < 0.001), the amount of motor impairment (P < 0.001), and the amount of combined limbmotor impairment (P < 0.001). For example, 87% of people with the most limb-motor impairment (four affected limbs and no useful movement) were in the lowest Self-Reported Functional Measure tertile, compared with 3% of people in the least-affected category of limb-motor impairment. Furthermore, visual, sensory, or memory impairment did not influence the correlation between limbmotor impairment and Self-Reported Functional Measure score.

CONCLUSION

The Self-Reported Functional Measure shows good concurrent and construct validities.

Dependence and perceived difficulty in daily activities in community-living stroke survivors 2 years after stroke: a study of instrumental structures

BACKGROUND AND PURPOSE

There is a need for better understanding of the structure of instruments for functional outcome assessment after discharge from rehabilitation. One purpose of the study was to contribute to the analysis of instrumental dimensionality. Another purpose was to compare disability in stroke patients within the younger age range 2 years after onset of stroke with that at discharge with respect to both dependence and patients' perceived difficulty and to extend the assessments with instrumental activities.

METHODS

We studied 68 stroke survivors aged 18 to 71 years at onset (59% aged <55 years) by means of interviews in their home, using activities from the Functional Independence Measure (FIM) and Instrumental Activity Measure (IAM) for ratings of dependence and perceived difficulty. Rasch analysis was used to construct calibrated linear measures and to evaluate the level of fit.

RESULTS

Acceptable models for comparison of dependence between discharge and follow-up were found for the physical and the social-cognitive items in FIM. However, personal care and social-cognitive items showed an increased level of dependence at follow-up compared with at discharge. A combination of physical activities from FIM and IAM also gave acceptable models for both dependence and perceived difficulty, and the hierarchical orders of activities are presented. In general, there was agreement between the ratings of dependence and perceived difficulty, but with some discrepancies. Men found it harder to be independent in such instrumental activities as cooking and cleaning than women; the opposite was true for small-scale shopping and locomotion outdoors. Subjects aged > or =55 years had slightly higher level of dependence and perceived difficulty in IAM activities than those below that age.

CONCLUSIONS

Changes in the hierarchical order of activities should be taken into account in follow-up studies. Differences in the environment between hospital and home, as well as differences in support and motivation, might explain the relatively larger degree of dependence at follow-up compared with at discharge and indicate the need for further rehabilitation efforts. Instrumental activities could be combined with FIM activities in a model. For individual items, ratings of both dependence and perceived difficulty may provide further insight into the disablement process.

The reliability of a self-reported measure of disease, impairment, and function in persons with spinal cord dysfunction

OBJECTIVE

To develop a self-report instrument that would provide information about the different levels of the disablement process, and that (1) was suitable for persons with spinal cord disease (SCD), (2) could be completed quickly, (3) could be mailed, (4) had acceptable reliability, and (5) would be clinically useful.

STUDY DESIGN

Test-retest using a convenience sample.

METHODS

Review of the literature and an expert panel were used to develop the instrument. It was mailed to 49,458 individuals in June 1995 and a second mailing was done in August 1995. A subset of 725 individuals who responded to both mailings was used to examine the instrument's test-retest reliability.

RESULTS

The instrument has a 4th grade reading level and has questions on causal disease, disease severity, impairment, activities of daily living (including a self-reported version of the Functional Independence Measure, the SRFM), and resource utilization. Individual item test-retest reliability was high for a mailed questionnaire; all kappa coefficients were near or above .60 and most were over .70. Intraclass correlation coefficient for the SRFM was .90 and internal consistency (Chronbach's alpha) was .96.

CONCLUSION

This instrument provides a new, rapid way to obtain information relative to the differing levels of the disablement process.