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21.06.2017 | Ausgabe 11/2017 Open Access

Quality of Life Research 11/2017

Measuring everyday functional competence using the Rasch assessment of everyday activity limitations (REAL) item bank

Zeitschrift:
Quality of Life Research > Ausgabe 11/2017
Autoren:
Martijn A. H. Oude Voshaar, Peter M. ten Klooster, Harald E. Vonkeman, Mart A. F. J. van de Laar
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s11136-017-1627-0) contains supplementary material, which is available to authorized users.

Abstract

Objective

Traditional patient-reported physical function instruments often poorly differentiate patients with mild-to-moderate disability. We describe the development and psychometric evaluation of a generic item bank for measuring everyday activity limitations in outpatient populations.

Study design and setting

Seventy-two items generated from patient interviews and mapped to the International Classification of Functioning, Disability and Health (ICF) domestic life chapter were administered to 1128 adults representative of the Dutch population. The partial credit model was fitted to the item responses and evaluated with respect to its assumptions, model fit, and differential item functioning (DIF). Measurement performance of a computerized adaptive testing (CAT) algorithm was compared with the SF-36 physical functioning scale (PF-10).

Results

A final bank of 41 items was developed. All items demonstrated acceptable fit to the partial credit model and measurement invariance across age, sex, and educational level. Five- and ten-item CAT simulations were shown to have high measurement precision, which exceeded that of SF-36 physical functioning scale across the physical function continuum. Floor effects were absent for a 10-item empirical CAT simulation, and ceiling effects were low (13.5%) compared with SF-36 physical functioning (38.1%). CAT also discriminated better than SF-36 physical functioning between age groups, number of chronic conditions, and respondents with or without rheumatic conditions.

Conclusion

The Rasch assessment of everyday activity limitations (REAL) item bank will hopefully prove a useful instrument for assessing everyday activity limitations. T-scores obtained using derived measures can be used to benchmark physical function outcomes against the general Dutch adult population.

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Zusatzmaterial
Supplementary material 1 (DOCX 14 kb)
11136_2017_1627_MOESM1_ESM.docx
Literatur
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