Ensuring the comparability of cross-national survey data on intimate partner violence against women: a cross-sectional, population-based study in the European Union

Abstract

Objectives: To ensure the cross-national comparability of the set of questions addressing physical and sexual intimate partner violence against women (IPVAW) included in the European Union (EU) Agency for Fundamental Rights (FRA) survey. Once the measurement invariance of these measures is established, we aim to make appropriate and valid comparisons of the levels of physical and sexual IPVAW across the EU countries.

Design: Cross-sectional, population-based study.

Participants: Data were drawn from the survey conducted by the FRA on violence against women, including the responses of 42 002 adult women from the 28 countries of the EU.

Main outcome measures: The set of questions addressing lifetime prevalence of physical and sexual IPVAW used in the FRA survey. The psychometric properties (ie, reliability and validity) of these measures were examined, as well as their latent structure and their measurement invariance across the 28 EU countries.

Results: The physical and sexual IPVAW measures presented adequate internal consistency and validity evidence based on their relations to other variables in all countries. A latent two-factor structure was supported and scalar invariance was established across countries. Our results showed that the average levels of physical and sexual IPVAW were highest in Denmark, Finland, Sweden and UK compared with the rest of the EU countries. In many of the other countries the levels of these types of violence overlapped, especially in the case of sexual IPVAW.

Conclusions: The findings of this study showed that the set of questions addressing physical and sexual IPVAW included in the FRA survey can be compared across all EU countries, highlighting the importance of testing the measurement equivalence of the instruments used in large sociodemographic surveys in order to make valid cross-national comparisons.

Keywords: European Union; cross-national research; intimate partner violence; measurement invariance; psychometrics; public health.