Abstract:
OBJECTIVES:this study aimed to investigate the construct validity and responsiveness of performance-based and self-reported measures of strength, mobility and balance after hip fracture. DESIGN:secondary analysis of clinical trial data. SUBJECTS:a total of 148 older people undergoing hip fracture rehabilitation. METHODS:correlation coefficients assessed construct validity. Internal responsiveness was assessed by calculating effect sizes (ES) I and II. Area under the receiver operating characteristic curve (AUC) assessed external responsiveness with change in EuroQol as the reference. RESULTS:correlations between performance-based and self-reported measures were small to medium (strength r = 0.17, mobility r = 0.45 and balance r = 0.37). The most responsive performance-based measures included walking speed (ESI 1.7, ESII 1.2), Physical Performance and Mobility Examination (ESI 1.3, ESII 1.0) and chair-rise test (ESI 1.1, ESII 0.8). Self-reported mobility (ESI 0.8, ESII 0.6) and strength (ESI 0.8, ESII 0.6) were more responsive than self-reported balance (ESI 0.3, ESII 0.2). External responsiveness (AUC) was greatest for walking speed (0.72) and lowest for the measures of body sway (0.53). CONCLUSION:self-reported and performance-based indices appear to assess different constructs and may provide complementary information about physical functioning in people after hip fracture. Measures of strength and mobility showed greater ability to detect change than measures of balance.
journal_name
Age Ageingjournal_title
Age and ageingauthors
Farag I,Sherrington C,Kamper SJ,Ferreira M,Moseley AM,Lord SR,Cameron IDdoi
10.1093/ageing/afs090subject
Has Abstractpub_date
2012-09-01 00:00:00pages
659-64issue
5eissn
0002-0729issn
1468-2834pii
afs090journal_volume
41pub_type
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