TY - JOUR
T1 - Improvement of a questionnaire measuring activity limitations in rising and sitting down in patients with lower-extremity disorders living at home
AU - Roorda, L.D.
AU - Molenaar, I.W.
AU - Lankhorst, G.J.
AU - Bouter, L.M.
PY - 2005
Y1 - 2005
N2 - Objective: To improve a self-administered questionnaire that includes 42 dichotomous items and measures activity limitations in rising and sitting down (R&S) in patients with lower-extremity disorders who live at home. Design: Cross-sectional study. Setting: Outpatient clinics of secondary and tertiary care centers. Participants: Patients (N=759; 47% men; mean age ± standard deviation, 60.7±15.2y) living at home, with lower-extremity disorders resulting from stroke, poliomyelitis, osteoarthritis, amputation, and complex regional pain syndrome type I. Interventions: Not applicable. Main Outcome Measures: (1) Unidimensionality, indicating that items assess only a single construct; (2) fit with the one-parameter logistic model (OPLM), yielding information about patient and item location parameters; (3) intratest reliability, indicating consistency of patients' item scores; and (4) content validity, indicating completeness with which the items cover the important aspects of the construct that they are attempting to represent. Results: Thirty-nine of 42 items: (1) loaded on 1 component (variance explained, 59%; item component loadings, ≥.51), (2) showed good fit with the OPLM (P=.15), (3) had a good intratest reliability (Cronbach α=.96), and (4) had a good content validity (all important aspects represented). Conclusions: A unidimensional scale that fits with the OPLM has been developed for measuring activity limitations in R&S in patients with lower-extremity disorders who live at home. © 2005 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.
AB - Objective: To improve a self-administered questionnaire that includes 42 dichotomous items and measures activity limitations in rising and sitting down (R&S) in patients with lower-extremity disorders who live at home. Design: Cross-sectional study. Setting: Outpatient clinics of secondary and tertiary care centers. Participants: Patients (N=759; 47% men; mean age ± standard deviation, 60.7±15.2y) living at home, with lower-extremity disorders resulting from stroke, poliomyelitis, osteoarthritis, amputation, and complex regional pain syndrome type I. Interventions: Not applicable. Main Outcome Measures: (1) Unidimensionality, indicating that items assess only a single construct; (2) fit with the one-parameter logistic model (OPLM), yielding information about patient and item location parameters; (3) intratest reliability, indicating consistency of patients' item scores; and (4) content validity, indicating completeness with which the items cover the important aspects of the construct that they are attempting to represent. Results: Thirty-nine of 42 items: (1) loaded on 1 component (variance explained, 59%; item component loadings, ≥.51), (2) showed good fit with the OPLM (P=.15), (3) had a good intratest reliability (Cronbach α=.96), and (4) had a good content validity (all important aspects represented). Conclusions: A unidimensional scale that fits with the OPLM has been developed for measuring activity limitations in R&S in patients with lower-extremity disorders who live at home. © 2005 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.
U2 - 10.1016/j.apmr.2005.06.005
DO - 10.1016/j.apmr.2005.06.005
M3 - Article
SN - 0003-9993
VL - 86
SP - 2204
EP - 2210
JO - Archives of Physical Medicine and Rehabilitation
JF - Archives of Physical Medicine and Rehabilitation
IS - 11
ER -