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Five CFA models were estimated based on previous findings and considerations of the content validity. The results indicated that the two-factor model (physical and mental health) without items 1 and 5 provided the best fit across all countries. Item 5 was removed due to low factor loadings in all estimated models and across all countries, while item 1 was removed because it was too general, making it difficult to determine whether it measured physical or mental health. The six-item version (SF-6) demonstrated adequate reliability and strict invariance across all countries in the invariance sequence models. The reported differences in physical and mental health dimensions were negligible and minor among all countries. 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