Reliability and validity of the French-Canadian Late Life Function and Disability Instrument in community-living wheelchair-users

Abstract

Purpose-To examine the test-retest reliability, standard error of measurement and minimal detectable change, construct validity, and ceiling and floor effects in the French-Canadian Late Life Function and Disability Instrument (LLFDI-F).Method-The LLFDI-F is a measure of activity (i.e. physical functioning of upper and lower extremities), and participation (i.e. frequency of and limitations with). The measure was administered over the telephone to a sample of community-living wheelchair-users, who were 50 years of age and older, in this 10-day retest methodological study. The sample (n=40) was mostly male (70%), had a mean age of 62.2 years, and mean experience with using a wheelchair of 20.2 years. Sixty-five percent used a manual wheelchair.Results-The test-retest intraclass correlation coefficients (ICC 2,1 ) for the participation component ranged from 0.68 to 0.90 and from 0.74 to 0.97 for the activity component. Minimal detectable changes ranged from 7.18 to 22.56 in the participation component and from 4.71 to 16.19 in the activity component. Mann-Whitney U tests revealed significant differences between manual and power wheelchair-users in the personal and instrumental role domains, and all areas in the activity component.Conclusion-There is support for the test-retest reliability, and construct validity of the LLFDI-F in community-living wheelchair-users, 50 years of age and older. However, because the majority of items in the lower-extremity domains of the activity component do not account for assistive Correspondence: François Routhier, PEng PhD, Centre interdisciplinaire de recherche en réadaptation et intégration sociale (CIRRIS), Institut de réadaptation en déficience physique de Québec (IRDPQ), 525 Hamel est, Québec, QC G1M 2S8 Canada. +418 529 9141,

Association Between Self-efficacy and Participation in Community-Dwelling Manual Wheelchair Users Aged 50 Years or Older

“…26 The measure has been shown to be reliable for use with adult wheelchair users (intraclass correlation coefficient [ICC]ϭ .86; 95% CIϭ.76, .93). 27 Independent variable of interestbody function domain. The selfefficacy with wheelchair use construct was measured using the 65-item Wheelchair Use Confidence Scale (WheelCon).…”

“…2). Only those continuous variables with a fair relationship (ie, rՆ.25 50(p525) ) with participation frequency or those categorical variables with a mean difference in participation frequency that exceeded the LLDI's 95% minimal detectable change 27 were included in the model. To minimize collinearity, all continuous variables were mean centered.…”

Measurement Properties of the Late Life Disability Index Among Individuals Who Use Power Wheelchairs as Their Primary Means of Mobility

“…A French version of the measure has been developed and validated. 17 Demographic information was collected on each participant including age, sex, education (1= no formal education, 11=post-graduate degree), income ($15,000 increments), marital status, living situation, and power wheelchair experience (experienced or new (< 6 months use)). Data from five other measures were collected for investigating validity.…”

French-Canadian translation of the WheelCon-M (WheelCon-M-F) and evaluation of its validity evidence using telephone administration

“…The LLFDI English version has been validated for use with several community-living, older adult populations, including those with multiple chronic conditions, osteoporosis, multiple sclerosis, stroke, heart disease and cancer [24]. The LLFDI-F has demonstrated test-retest reliability (ICC 2,1 ¼ 0.86 and 0.87 for frequency and limitation respectively) and validity with older, community-dwelling wheelchair users [25]. Further, wheelchair confidence has previously been shown to be a positive and significant determinant of the frequency of participation in older wheelchair users [11,12].…”