■ 2015 First-Year Performance Summary: The purpose of the present study is to apply a health belief model to the serious perception of an increase in youth obesity, and to develop and validate a measurement tool for youth obesity prevention among this ...
■ 2015 First-Year Performance Summary: The purpose of the present study is to apply a health belief model to the serious perception of an increase in youth obesity, and to develop and validate a measurement tool for youth obesity prevention among this group who are experiencing increasing rates of obesity. The specific goals of this study are to 1) apply a health belief model to develop a measurement tool for obesity prevention among youth who are seeing rising rates of obesity, and 2) provide an integrated validation procedure and foundation for developing this measurement tool. In stage 1 of the substantive domain for developing an obesity prevention scale, this study formed scale questions for obesity prevention by utilizing the inductive method which identifies subordinate concepts that are included in scale development, Devellis’ (2012) theory as an aid to clarity, and Hively’s (1974) domain-referenced testing. In stages 2 and 3, this study applied the Rasch model to sample 1. To this end, this study will apply a parallel analysis and ESEM to sample 1 to determine the factor structure of the obesity prevention scale in step 1. Presently, this study is on the verge of conducting analysis on the second and third stages in the substantive domain of first-year obesity prevention scale development, and on the first stage of the structural domains.
■ Second-Year Research Plan Performance Summary: The second-year research is at the stage of ensuring validity. In the second year, this study will examine the stability of the factor structure using sample 2 in the second stage of the structural domains, and apply a bifactor model and second-order model to verify which one shows a superior fidelity for the consideration of the G factor. In stages 3, 4, and 5, the Rasch model will be applied to sample 2 and will present empirical evidence. In external domains, this study will conduct latent mean analysis using sample 2 based on physical activity levels and criterion-related validity that were determined to theoretically have a significant correlation with the obesity prevention scale in stage 1, and based on gender (male, female), and obesity status (obese, not obese) in stage 2. Lastly, in stage 3, this study will verify the effect of the social desirability response in the Rasch model (King & Bruner, 2000; Lessard, 2008). The statistical significance level () of all methods of analysis were set at .05. This study will use the following statistical programs. 1) The common factor model will analyze exploratory equation modeling, Bayesian structural equation modeling, confirmatory factor analysis, and bifactor and second-order models. The Rasch model will use the WINSTEPS 4.0.0 (Linacre, 2017) analytic program. 2) As an analysis of criterion-related validity that applies structural equation modeling. 3) Latent mean analysis (LMA) will be carried out based on gender and obesity status. The Mplus 7.4 (Muthén & Muthén, 2016) analytic program will be used for this. The second-year research is currently underway since the results may be released after the first-year research results are completely published.