Background: Research studies aimed at evaluating satisfaction with the couple relationship demonstrate that differences in satisfaction largely depend on three sociodemographic variables: sex (men/women), living together (yes/no), and having children (yes/no). The Satisfaction in Couple Relationship Scale (SCR) has shown great potential in measuring satisfaction in couple relationships. This study aims to demonstrate its factorial invariance to these three variables. Method: Confirmatory factor analyses were carried out on subsamples of women and men, people who live together and those who do not cohabit, and people who have children and those who do not have children. A multigroup factor analysis was also performed to test the factorial invariance of the SCR based on the variables mentioned above. Result: The obtained results showed factorial invariance, metric invariance, and strong invariance for all three variables, and strict invariance concerning the “sex” variable. It was also confirmed that men, people who do not cohabit, and people without children, are more satisfied with their relationships than women, people who cohabit, and people with children. Conclusion: The scale has demonstrated an adequate factorial invariance for the analysed variables, confirming the possibility of using it for different sample types.

Keywords:
Instrument validation, scale, factorial invariance, couple relationship, marital satisfaction

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