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Measurement properties of the Activities-specific Balance Confidence Scale among individuals with stroke
Erica M Botner1, William C Miller, Janice J Eng
1School of Rehabilitation Sciences, University of British Columbia, Vancouver, BC V5Z 1L8, Canada.
Purpose:
To examine the reliability and validity of the Activities-specific Balance Confidence (ABC) scale among individuals with stroke.
Method:
Descriptive measurement study using a 4-week test-retest design. Data were collected at a tertiary rehabilitation centre form a community-dwelling sample of ambulatory older adults who sustained one stroke at least 1 year prior to the study. During the first measurement session, the total sample (n = 77) completed the ABC as well as the Berg Balance Scale (BBS) and gait speed. The reliability sample (n = 24), a subset of the larger data set, completed the ABC again 4 weeks later.
Results:
Internal consistency of the ABC was 0.94 and test-retest reliability was ICC = 0.85 (95% CI, 0.68, 0.93). A moderate significant positive, linear correlation with both the BBS (rho = 0.36, P < 0.001) and gait speed (rho = 0.48, P < 0.001) was observed. A factor analysis using principal component analysis indicated that the ABC measures two components of balance self-efficacy (component 1 = perceived low-risk activities; component 2 = perceived high-risk activities).
Conclusion:
The ABC has acceptable measurement properties as demonstrated in this sample of individuals with stroke. This study provides further support for the use of the scale.
