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Construct validity of Comprehensive High-Level Activity Mobility Predictor (CHAMP) for male servicemembers with traumatic lower-limb loss

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Author(s): Robert S. Gailey, PhD, PT | COL (Ret) Charles Scoville, PT, DPT | Ignacio A. Gaunaurd, PhD, MSPT | Michele A. Raya, PhD, PT, SCS, ATC | Alison A. Linberg, DPT, ATC | COL (Ret) Paul D. Stoneman, PhD, PT, MPT, DPT, OCS, SCS | MAJ (Ret) Stuart M. Campbell, MPT | Kathryn E. Roach, PhD, PT

Journal: Journal of Rehabilitation Research and Development
ISSN 0748-7711

Volume: 50;
Issue: 7;
Start page: 919;
Date: 2013;
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Keywords: 6-minute walk test | agility | Amputee Mobility Predictor | CHAMP | construct validity | high-level mobility | lower-limb loss | military personnel | OIF/OEF | traumatic amputation

ABSTRACT
This study examined the convergent construct validity of a new performance-based assessment instrument called the Comprehensive High-Level Activity Mobility Predictor (CHAMP) as a measure of high-level mobility in servicemembers (SMs) with traumatic lower-limb loss (LLL). The study was completed by 118 SMs. Convergent construct validity of the CHAMP was established using the 6-minute walk test (6MWT) as a measure of overall mobility and physical function and the Amputee Mobility Predictor (AMP) as a measure of basic prosthetic mobility. The known group methods construct validity examined disparities in high-level mobility capability among SMs with different levels of LLL. The CHAMP score demonstrated a strong positive relationship between 6MWT distance (r = 0.80, p < 0.001) and AMP score (r = 0.87, p < 0.001), respectively. In addition, the CHAMP can discriminate between different levels of LLL. Study findings support the CHAMP as a valid performance-based assessment instrument of high-level mobility for SMs with traumatic LLL.
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