Journal
RESEARCH IN DEVELOPMENTAL DISABILITIES
Volume 31, Issue 4, Pages 903-913Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ridd.2010.02.010
Keywords
Validity; Physical activity measure; Measurement property
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Funding
- PHS HHS [U59/CCU 321826] Funding Source: Medline
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The purpose of this study was to investigate the construct validity of the Self-Efficacy/Social Support for Activity for persons with Intellectual Disability (SE/SS-AID) scales developed by Peterson, Peterson, Lowe, & Nothwehr (2009). A total of 146 participants with intellectual disabilities completed 6 self-efficacy (SE) items and 18 social support (SS) items. After applying the Rasch rating model, all SE items and 17 SS items fit the model and measured a single-construct. Thus, it was able to determine the item difficulty and person's level of SE and SS for physical activity by calculated logit scores. No items showed evidence for differential functioning by the level of intellectual disability. Model fit of SS subscales (e.g., staff, family, and peer) showed good-fit as well. In conclusion, SE and SS scales for physical activity can be measured more accurately for persons with intellectual disabilities by using the modified scales validated in this study. (C) 2010 Elsevier Ltd. All rights reserved.
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