Cath M Sackley1, Helen J Hill, Kate Pound, Andy Foxall. 1. School of Health Sciences, University of Birmingham, 52 Prichatts Road, Edgbaston, Birmingham B15 1TT, UK. c.m.sackley@bham.ac.uk
Abstract
OBJECTIVE: To examine the intra-rater reliability of sitting symmetry and weight-shift activity measurements in poststroke adults. DESIGN: An intra-rater reliability study. SETTING: A community setting. SUBJECTS: Adult stroke survivors attending stroke support groups within the community of Nottingham (U.K.). MAIN MEASURES: The Balance Performance Monitor used to measure sitting symmetry and weight-shift activity. Intraclass correlation coefficients (ICCs) and their 95% confidence intervals (95% CI) were calculated. The Bland Altman method for assessing agreement is also presented. RESULTS: We tested 49 participants (median age 73 years; interquartile range 68-81 years). Between-test reliability for sitting symmetry was high: ICC (1,1) = 0.93 (95% CI 0.87 < or = ICC < or = 0.96). The mean difference between the measures (d) was -0.08 (95% CI -0.48 < or = d < or = 0.31); the standard deviation of the differences (SDdiff) was 1.383. The coefficient of repeatability was 2.76; the 95% limits of agreement were -2.850 and 2.682. Between-test reliability for weight-shift activity was also high: ICC (1,1) = 0.86 (95% CI 0.77 < or = ICC < or = 0.92). Bland-Altman d = -0.08 (95% CI -0.19 < or = d < or = 0.35), SDdiff = 0.936. The coefficient of repeatability was 1.87; the 95% limits of agreement were -1.792 and 1.952. CONCLUSIONS: The 95% CI for d for both parameters crossed zero, indicating that between-test bias is unlikely. Sitting symmetry and weight-shift activity measures demonstrated acceptable levels of reliability.
OBJECTIVE: To examine the intra-rater reliability of sitting symmetry and weight-shift activity measurements in poststroke adults. DESIGN: An intra-rater reliability study. SETTING: A community setting. SUBJECTS: Adult stroke survivors attending stroke support groups within the community of Nottingham (U.K.). MAIN MEASURES: The Balance Performance Monitor used to measure sitting symmetry and weight-shift activity. Intraclass correlation coefficients (ICCs) and their 95% confidence intervals (95% CI) were calculated. The Bland Altman method for assessing agreement is also presented. RESULTS: We tested 49 participants (median age 73 years; interquartile range 68-81 years). Between-test reliability for sitting symmetry was high: ICC (1,1) = 0.93 (95% CI 0.87 < or = ICC < or = 0.96). The mean difference between the measures (d) was -0.08 (95% CI -0.48 < or = d < or = 0.31); the standard deviation of the differences (SDdiff) was 1.383. The coefficient of repeatability was 2.76; the 95% limits of agreement were -2.850 and 2.682. Between-test reliability for weight-shift activity was also high: ICC (1,1) = 0.86 (95% CI 0.77 < or = ICC < or = 0.92). Bland-Altman d = -0.08 (95% CI -0.19 < or = d < or = 0.35), SDdiff = 0.936. The coefficient of repeatability was 1.87; the 95% limits of agreement were -1.792 and 1.952. CONCLUSIONS: The 95% CI for d for both parameters crossed zero, indicating that between-test bias is unlikely. Sitting symmetry and weight-shift activity measures demonstrated acceptable levels of reliability.