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BACKGROUND Obesity is a major public health problem in the world. Physical inactivity is one of the significant risk factors for obesity. Both problems are prevalent in Indonesia. However, there are no valid Indonesian tools to explore the influences of PA. Owing to cultural and social-context issues, developing the Indonesian-Bahasa version of instrument is an important task to explore the influence on PA in Indonesia. OBJECTIVE This study aimed to validate the cultural appropriateness of the Indonesian-Bahasa version of the Influences on Physical Activity Instrument (IPAI-I) and test its psychometric properties. METHODS Using a cross-sectional design, our study samples came from community health-centers in west-Java, where 1200 residents underwent health screening. Eligible subjects were 846 obese-adult who were recruited as study participants. The Indonesian version of IPAI-I was assessed using Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) to examine the psychometric properties, where reliability was tested using internal consistency and stability. RESULTS Through EFA via Principal Axis Factoring with Oblimin rotation, the 21-item IPAI-I exhibited cross-cultural appropriateness, readability with three factors in the individual domain, one factor in the support domain, and two factors in the environment domain. A second-order confirmatory factor analysis demonstrated the model’s goodness of fit: χ2/df = 1.33, GFI =0.94, and RMSEA =0.031 (p < .01). The support domain and environment domain were moderately correlated (r =0.51; p < .001), but the two domains had a very low correlation with the individual domain. The reliability of the instrument was tested by intraclass correlation and Cronbach’s α. The factors’ intra-rater reliability values were 0.73–0.92, and the Cronbach's alphas were 0.82–0.91. CONCLUSIONS The IPAI-I is valid and reliable for exploring the influences on physical activity for overweight or obese individuals in Indonesia. |
