To explore shortened response formats for use with the Activities-specific Balance Confidence (ABC) Scale and then evaluate the unidimensionality of the scale, the item difficulty, the scale for redundancy and content gaps, and the item standard error of measurement (SEM) and internal consistency reliability among aging individuals with a lower-limb amputation living in the community.
Secondary analysis of cross-sectional survey and chart review data.
Outpatient amputee clinics, Ontario, Canada.
Community living adults (N=448; =50y; mean, 68y) who have used a prosthesis for at least 6 months for a major unilateral lower-limb amputation. Of the participants, 325 (72.5%) were men.
Not applicable.
ABC Scale.
A 5-option response format outperformed 4- and 6-option formats. Factor analyses confirmed a unidimensional scale. The distance between response options is not the same for all items on the scale, evident by the Rasch Partial Credit Model (PCM) having a better fit to the data than the Rasch Rating Scale Model. Two items, however, did not fit the PCM within statistical reason. Revising the wording of the 2 items may resolve the misfit and improve the construct validity and lower the standard error of measurement. Overall, the difficulty of the scale's items is appropriate for use with aging individuals with lower-limb amputation, and is most reliable (Cronbach a=0.94) for use with individuals with moderately low balance confidence levels.
The ABC Scale with a simplified 5-option response format is a valid and reliable measure of balance confidence for use with individuals aging with a lower-limb amputation.
Notes
Cites: J Am Geriatr Soc. 2005 Mar;53(3):501-1015743297
Cites: J Gerontol B Psychol Sci Soc Sci. 1998 Jan;53(1):P43-509469171
Cites: Disabil Rehabil. 2006 Oct 30;28(20):1287-9217083176
Cites: Health Educ Res. 2006 Dec;21 Suppl 1:i19-3216880221
Cites: Health Educ Res. 2006 Dec;21 Suppl 1:i4-1817018765
Cites: Health Educ Res. 2006 Dec;21 Suppl 1:i33-4617035352
Cites: Arch Phys Med Rehabil. 2006 Dec;87(12):1597-60417141639
Cites: Mov Disord. 2006 Dec;21(12):2101-516991140
Cites: Phys Ther. 2007 Mar;87(3):282-9117284545
Cites: Arch Phys Med Rehabil. 2007 May;88(5):664-7217466738
Cites: Adv Data. 2007 Sep 21;(392):1-1617953135
Cites: Aging Ment Health. 2008 Nov;12(6):684-9919023720
Cites: Health Technol Assess. 2009 Feb;13(12):iii, ix-x, 1-17719216837
Cites: Int J Nurs Stud. 2009 Oct;46(10):1313-919394017