Article

OBJECTIVE: To examine the reliability, validity, and factor structure of the Late
Life Disability Instrument (LLDI) in individuals who use power wheelchairs as
their primary means of mobility. DESIGN: A 4-week, test-retest study design.
SETTING: Five Canadian cities. PARTICIPANTS: The validity sample included 115 new
and experienced power mobility users, and the reliability sample included 85
experienced users (N=115).
These volunteer samples included individuals who were
aged >/=50 years and independently used power mobility as their primary means of
mobility. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: The LLDI measures
participation in 2 dimensions of 16 life activities: frequency and perceived
limitations. Validity measures included the Wheelchair Skills Test-power version,
the Assistive Technology Outcomes Profile for Mobility, the Hospital Anxiety and
Depression Scale, the Power Mobility Wheelchair Confidence Measure, and the Life
Space Assessment. RESULTS: For the reliability sample, raw intraclass
correlational coefficients for limitation and frequency dimension scores ranged
from .855 (95% confidence interval .781-.905) to .883 (95% confidence interval,
.822-.924), respectively. For the validity sample, scores on the LLDI were
correlated as hypothesized with scores on validity measures. The factor structure
that was identified with the original sample was not replicated among power
wheelchair users. For LLDI frequency, exploratory factor analysis indicated that
5 of the original 16 items did not perform similarly among power wheelchair
users. For LLDI limitations, a 1-factor, rather than a 2-factor, solution was
identified. CONCLUSIONS: The study provides evidence in support of the
reliability and validity of the measure but suggests that the original subscale
scores may not be applicable to power wheelchair users.
CI - Copyright (c) 2014 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS