Test-retest reliability, validity, and sensitivity of the Chedoke arm and hand activity inventory: a new measure of upper-limb function for survivors of stroke.

OBJECTIVES To estimate the test-retest reliability and validity of the Chedoke Arm and Hand Activity Inventory (CAHAI) and to test whether the CAHAI was more sensitive to change in upper-limb function than the Impairment Inventory of the Chedoke-McMaster Stroke Assessment (CMSA) and the Action Research Arm Test (ARAT). DESIGN Construct validation process. SETTING Inpatient/outpatient rehabilitation facilities. PARTICIPANTS Stratified sample of 39 survivors of stroke: 24 early (mean age, 71.4 y; mean days poststroke, 27.3) and 15 chronic (mean age, 64.0 y; mean days poststroke, 101.7). INTERVENTION Regular therapy. MAIN OUTCOME MEASURES Intraclass correlation coefficients (ICCs), receiver operating characteristic (ROC), standard error of measurement, and correlation coefficients. RESULTS High interrater reliability was established with an ICC of .98 (95% confidence interval [CI], .96-.99). The minimal detectable change score was 6.3 CAHAI points. Higher correlations were obtained between the CAHAI and the ARAT and CMSA scores compared with the CMSA shoulder pain scores (1-sided, P=.001). Areas under the ROC curves were as follows: CAHAI, .95 (95% CI, 0.87-1.00); CMSA, .76 (95% CI, .61-.92); and ARAT, .88 (95% CI, 0.76-1.00). CONCLUSIONS High interrater reliability and convergent and discriminant cross-sectional validity were established for the CAHAI. The CAHAI is more sensitive to clinically important change than the ARAT.