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Although Interdependent Happiness Scale (IHS) has been used in different socio-cultural contexts, no study has tested the measurement invariance across countries. Because previous research did not agree on the dimensionality of the scale, we primarily investigated the factorial structure of the IHS, comparing the one-factor model to three-factor, second-order, and bifactor models. We also evaluated the applicability of the IHS to Italian (N = 290) and Polish samples (students: N = 253; community: N = 241) using a multigroup confirmatory factor analysis. We investigated also whether the scale measures an aspect of happiness different from satisfaction with life. The bifactor model fitted the sample data better than alternative models in all samples. The general factor accounted for over 90% of the reliable variance in the total IHS score for all samples. Our study supported the configural and metric invariance of the bifactor model in the Italian and Polish versions of the IHS, ensuring the comparability of correlations involving the IHS scores in the two different cultures and samples. We showed that IHS is not redundant with the SWLS, although the two concepts are deeply intertwined. Our findings provided support for a conceptualization of interdependent happiness as a hierarchically organized construct. [ABSTRACT FROM AUTHOR]

Intolerance of Uncertainty is a fundamental transdiagnostic personality construct hierarchically organized with a core general factor underlying diverse clinical manifestations. The current study evaluated the construct validity of the Intolerance of Uncertainty Inventory, a two-part scale separately assessing a unitary Intolerance of Uncertainty disposition to consider uncertainties to be unacceptable and threatening (Part A) and the consequences of such disposition, regarding experiential avoidance, chronic doubt, overestimation of threat, worrying, control of uncertain situations, and seeking reassurance (Part B). Community members (N = 1046; Mean age = 36.69 ± 12.31 years; 61% females) completed the Intolerance of Uncertainty Inventory with the Beck Depression Inventory-II and the State-Trait Anxiety Inventory. Part A demonstrated a robust unidimensional structure and an excellent convergent validity with Part B. A bifactor model was the best fitting model for Part B. Based on these results, we compared the hierarchical factor scores with summated ratings clinical proxy groups reporting anxiety and depression symptoms. Summated rating scores were associated with both depression and anxiety and proportionally increased with the co-occurrence of depressive and anxious symptoms. By contrast, hierarchical scores were useful to detect which facets mostly separated between for depression and anxiety groups. In sum, Part A was a reliable and valid transdiagnostic measure of Intolerance of Uncertainty. The Part B was arguably more useful for assessing clinical manifestations of Intolerance of Uncertainty for specific disorders, provided that hierarchical scores are used. Overall, our study suggest that clinical assessments might need to shift toward hierarchical factor scores. [ABSTRACT FROM AUTHOR]