Construct Validity of the Prosthetic Limb Users Survey of Mobility (PLUS-M) in Adults With Lower Limb Amputation

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• 作者：Brian J. Hafner ; PhD^a ; ^{bhafner@uw.edu} ; Ignacio A. Gaunaurd ; PhD ; MSPT^b ; ^c ; Sara J. Morgan ; PhD ; CPO^a ; Dagmar Amtmann ; PhD^a ; Rana Salem ; MA^a ; Robert S. Gailey ; PhD ; PT^b ; ^c
• 关键词：Amputation ; Artificial limbs ; Motor activity ; Movement ; Outcome assessment (health care) ; Rehabilitation ; Self report
• 刊名：Archives of Physical Medicine and Rehabilitation
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：98
• 期：2
• 页码：277-285
• 全文大小：465 K
• 卷排序：98

文摘

To assess construct validity of the Prosthetic Limb Users Survey of Mobility (PLUS-M), a self-report mobility measure for people with lower limb amputation (LLA).DesignCross-sectional study.SettingPrivate prosthetic clinics (n=37).ParticipantsCurrent lower limb prosthesis users (N=199; mean age ± SD, 55.4±14.3y; 71.4% men) were assessed before receiving a replacement prosthesis, prosthetic socket, and/or prosthetic knee.InterventionsNot applicable.Main Outcome MeasuresConvergent construct validity was examined using correlations between participants' PLUS-M T-scores and measures of physical function, mobility, and balance, including the Amputee Mobility Predictor (AMP), timed Up and Go (TUG), Patient-Reported Outcomes Measurement Information System–Physical Function (PROMIS-PF), Prosthesis Evaluation Questionnaire–Mobility Subscale (PEQ-MS), and Activities-specific Balance Confidence (ABC) Scale. Known-groups construct validity was evaluated by comparing differences in PLUS-M T-scores among participants grouped by Medicare Functional Classification Level (MFCL).ResultsPLUS-M T-scores demonstrated a moderate positive relationship with AMP scores (ρ=.54, P<.001) and a moderate negative relationship with TUG times (ρ=−.56, P<.001). The PLUS-M also showed a strong positive relationship with PEQ-MS scores (ρ=.78, P<.001), ABC Scale scores (ρ=.81, P<.001), and PROMIS-PF T-scores (ρ=.81, P<.001). Significant differences (P<.05) in PLUS-M T-scores were found among groups of people classified by different MFCLs.ConclusionsStudy results support the validity of the PLUS-M as a self-report measure of prosthetic mobility. Correlations between PLUS-M and measures of physical function, mobility, and balance indicate convergent construct validity. Similarly, significant differences in PLUS-M T-scores across MFCL groups provide evidence of known-groups construct validity. In summary, evidence indicates that PLUS-M has good construct validity among people with LLA.