Development of items that assess physical function in children who use wheelchairs

The Wheelchair Outcome Measure for Young People (WhOM-YP): modification and metrics for children and youth with mobility limitations

Purpose: Wheelchairs enhance children's mobility and participation in daily life, yet few participation measures are used to evaluate wheeled mobility interventions. The Wheelchair Outcome Measure for Young People (WhOM-YP) addresses this gap, evaluating importance of and satisfaction with client-identified participation outcomes inside and outside home for children aged 18 years and younger who need wheeled mobility interventions.Methods: Mixed methods study using semi-structured interviews with nine experienced therapists and nine wheelchair users (11-18 years) evaluated the appropriateness of adult Wheelchair Outcome Measure for younger ages. Four key informants reviewed findings and offered additional modifications. Two-week test-retest reliability and construct validity were examined with children and parents; Spearman correlations were estimated among child and parent scores and Mann-Whitney U Test analyzed difference in outside home participation mean weighted satisfaction scores between new and experienced power mobility users.Results: Modifications included age-appropriate changes, adding visuals to rating scales, and separate child and adult ratings dependent on child's age and abilities. Two week test-retest reliability estimates were as hypothesized; WhOM-YP mean satisfaction and mean weighted satisfaction summary scores for inside and outside home participation demonstrated intraclass correlation coefficient (ICC_(2,1)) > 0.70. Discrimination between groups was as predicted; mean weighted satisfaction outside participation difference (p < 0.0001) demonstrated between experienced (median 74.2, n = 22) and inexperienced (median 32.9, n = 10) users. Revised format was conducive for individuals with diverse needs; images helped those with emerging numeracy and literacy skills, and proxy rating could be accommodated.Conclusion: Evidence supports WhOM-YP reliability and validity for measuring participation outcomes in daily life for young people.Implications for rehabilitationThe WhOM-YP offers a client-centred, individualized, participation focused outcome measure for young people who use wheeled mobility. Therapists, children, youth and parents were consulted throughout its development to ensure that the measure is relevant to their needs.The WhOM-YP can be used with children 18 years-of-age and younger. Consistent ratings over a two-week period of time (when no change was expected) were stronger for those 8 years and older. Children as young as 5 years of age can use this measure to share their views but caution is needed in score interpretation for those below 8 years-of-age.The option of parent-report to augment or provide a proxy measure increases WhOM-YP usefulness in rating individualized participation outcomes for a more age and ability diverse population.This is the first study to examine reliability and validity evidence in regards to using the Wheelchair Outcome Measure for Young People (WhOM-YP) with children who have mobility limitations and their parents.

Important elements of measuring participation for children who need or use power mobility: a modified Delphi survey

AIM

To identify and reach consensus on important elements of measuring participation in everyday life for children who need or use power mobility.

METHOD

A panel (n=74) of parents, therapists, and researchers with pediatric power mobility and participation expertise completed an online modified Delphi survey. Three rounds determined important elements of participation for two groups: early childhood (18mo-5y) and school-aged (6-12y). 'Elements of participation' defined the 'who, what, where, and how' of measuring participation, generated from a literature review and participants' suggestions. Consensus was set a priori as ≥80% agreement.

RESULTS

Consensus was reached on 21 out of 48 elements of participation important to measure for our population: eight elements for the younger group and 18 elements for the older group. When ranked by importance, four of the top five elements were common across both age groups.

INTERPRETATION

For children using power mobility, measuring participation in a variety of settings is critical, along with considering both the child's and family's participation. Evaluating child engagement and enjoyment of participation are priorities, as is measuring barriers and facilitators. For school-aged children, evaluating child and parent reports of participation are essential. These elements can guide tool selection and/or development.

A new computerized adaptive test advancing the measurement of health-related quality of life (HRQoL) in children: the Kids-CAT

PURPOSE

Assessing health-related quality of life (HRQoL) via Computerized Adaptive Tests (CAT) provides greater measurement precision coupled with a lower test burden compared to conventional tests. Currently, there are no European pediatric HRQoL CATs available. This manuscript aims at describing the development of a HRQoL CAT for children and adolescents: the Kids-CAT, which was developed based on the established KIDSCREEN-27 HRQoL domain structure.

METHODS

The Kids-CAT was developed combining classical test theory and item response theory methods and using large archival data of European KIDSCREEN norm studies (n = 10,577-19,580). Methods were applied in line with the US PROMIS project. Item bank development included the investigation of unidimensionality, local independence, exploration of Differential Item Functioning (DIF), evaluation of Item Response Curves (IRCs), estimation and norming of item parameters as well as first CAT simulations.

RESULTS

The Kids-CAT was successfully built covering five item banks (with 26-46 items each) to measure physical well-being, psychological well-being, parent relations, social support and peers, and school well-being. The Kids-CAT item banks proved excellent psychometric properties: high content validity, unidimensionality, local independence, low DIF, and model conform IRCs. In CAT simulations, seven items were needed to achieve a measurement precision between .8 and .9 (reliability). It has a child-friendly design, is easy accessible online and gives immediate feedback reports of scores.

CONCLUSIONS

The Kids-CAT has the potential to advance pediatric HRQoL measurement by making it less burdensome and enhancing the patient-doctor communication.