Evaluating the properties of a stage-specific self-efficacy scale for physical activity using classical test theory, confirmatory factor analysis and item response modeling

Masse, L.C., Heesch, K C, Eason, K.E. and Wilson, M. (2006) Evaluating the properties of a stage-specific self-efficacy scale for physical activity using classical test theory, confirmatory factor analysis and item response modeling. Health Education Research: Theory and Practice, 21 S1: i33-i46. doi:10.1093/her/cyl106


Author Masse, L.C.
Heesch, K C
Eason, K.E.
Wilson, M.
Title Evaluating the properties of a stage-specific self-efficacy scale for physical activity using classical test theory, confirmatory factor analysis and item response modeling
Journal name Health Education Research: Theory and Practice   Check publisher's open access policy
ISSN 0268-1153
1465-3648
Publication date 2006
Sub-type Article (original research)
DOI 10.1093/her/cyl106
Volume 21
Issue S1
Start page i33
End page i46
Total pages 14
Editor M. Eriksen
Place of publication Cary, NC, United States
Publisher Oxford University Press
Collection year 2006
Language eng
Subject C1
321404 Sport and Exercise Psychology
321216 Health Promotion
730219 Behaviour and health
Abstract The purpose of this paper was to evaluate the psychometric properties of a stage-specific selfefficacy scale for physical activity with classical test theory (CTT), confirmatory factor analysis (CFA) and item response modeling (IRM). Women who enrolled in the Women On The Move study completed a 20-item stage-specific self-efficacy scale developed for this study [n = 226, 51.1% African-American and 48.9% Hispanic women, mean age = 49.2 (67.0) years, mean body mass index = 29.7 (66.4)]. Three analyses were conducted: (i) a CTT item analysis, (ii) a CFA to validate the factor structure and (iii) an IRM analysis. The CTT item analysis and the CFA results showed that the scale had high internal consistency (ranging from 0.76 to 0.93) and a strong factor structure. Results also showed that the scale could be improved by modifying or eliminating some of the existing items without significantly altering the content of the scale. The IRM results also showed that the scale had few items that targeted high self-efficacy and the stage-specific assumption underlying the scale was rejected. In addition, the IRM analyses found that the five-point response format functioned more like a four-point response format. Overall, employing multiple methods to assess the psychometric properties of the stage-specific self-efficacy scale demonstrated the complimentary nature of these methods and it highlighted the strengths and weaknesses of this scale.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 10:00:17 EST