Psychometric characteristics of the Serbian version of the European Health Interview Survey—Physical Activity Questionnaire—EHIS-PAQ

The European Health Interview Survey—Physical Activity Questionnaire (EHIS-PAQ) was specially developed to gather data on physical activity of the population for the production of public health statistics in Europe and the calculation of European Core Health Indicators. The aim of this study was to examine the psychometric properties of the Serbian version of the EHIS-PAQ. This was a secondary analysis of the data from the 2019 Serbian National Health Survey, which included 15,621 participants. The psychometric properties of the EHIS-PAQ were examined using exploratory (EFA) and confirmatory factor analyses (CFA). The EFA revealed the existence of three factors that explained 55.02% of the variance. Factor loadings varied from 0.515 to 0.941. The CFA showed that adjusted goodness of fit index (AGFI) was 0.958, goodness of fit index (GFI) was 0.977, comparative fit index (CFI) was 0.958, and root mean square error of approximation (RMSEA) was 0.063 (95% CI: 0.056-0.069). The Serbian version of the EHIS-PAQ showed good construct validity and can be used as a convenient measure of physical activity in the population.