Psychometric Properties of the Hungarian Passion Scale-8 (PS-8-HU) in Physically Active and Inactive Adults.

The 8-item Passion Scale (PS-8) is a unidimensional instrument used in dual versus single passion research. The PS-8 was validated in Icelandic, Persian, and Turkish student samples. In this study, we translated the PS-8 and validated it with physically active and inactive adults from Hungary. We also evaluated measurement invariance (across gender, physical activity, exercise frequency, and age groups) of the Hungarian version of the Passion scale (PS-8-HU). Data were collected online between fall 2023 and winter 2024, including a test and retest phase. The sample comprised 729 Hungarian physically active and inactive adults (68% females, 32% males; ages 18-78 years), of whom 196 participated in the retest. We used confirmatory factor analysis (CFA), item analysis, correlations, t-test and ANOVA in checking the scale's validity and reliability, and we used a multigroup CFA to test the measurement invariance. The results supperted a univariate structure of the PS-8-HU. The instrument was invariant for gender (at the strict level), exercise frequency (metric), physical activity (metric), and age (scalar). The internal reliability of the PS-8-HU was .93 and test-retest reliability was .77. The PS-8-HU also exhibited good concurrent and construct validities, high homogeneity, and adequate discriminant validity.