Couple Adjustment and Differentiation of Self in the United States, Italy, and Spain: A Cross‐Cultural Study

This study comprises a first attempt to explore a cross‐cultural application of Bowen family systems theory and examines the relationship between differentiation of self and couple adjustment using measurement invariance. A sample of 2,141 individuals (n = 915 from the United States; n = 635 from Italy; n = 591 from Spain) completed measures of differentiation of self (DSI‐R; Skowron & Schmitt, J Marital Fam Ther, 29, 2003, 209) and couple adjustment (DAS; Spanier, J Marriage Fam, 38, 1976, 15). Results showed evidence of partial measurement equivalence for the DSI‐R across the three samples. Additionally, results from latent regression showed that less emotional cutoff predicted greater couple adjustment in the United States, Spain, and Italy, whereas greater emotional reactivity predicted poorer couple adjustment only in the more collectivistic cultures, Spain and Italy. Our findings are consistent with prior empirical studies, which suggest that emotional cutoff is a strong predictor of relationship adjustment. The use of measurement invariance provides a foundation for future studies to continue employing rigorous statistical methods when examining constructs across different cultures. The findings highlight culture‐specific similarities and differences in differentiation that may benefit practitioners by informing psychotherapy with individuals, couples, or families from diverse populations. Resumen Este estudio constituye un primer intento de explorar la aplicabilidad intercultural de la teoría de sistemas familiares de Bowen y de analizar la relación entre la diferenciación del self y el ajuste de la pareja utilizando un análisis de invariancia. Una muestra de 2.141 personas (n = 915 de Estados Unidos; n = 635 de Italia; n = 591 de España), completaron medidas de diferenciación del self (DSI‐R; Skowron & Schmitt, 2003) y de ajuste diádico (DAS; Spanier, 1976). Los resultados aportan pruebas de equivalencia parcial de las medidas del DSI‐R entre las tres muestras. Además, los resultados de la regresión latente indicaron que un menor corte emocional predijo mayor ajuste de la pareja en Estados Unidos, España e Italia, mientras que una mayor reactividad emocional predijo un menor ajuste de la pareja solo en las culturas más colectivistas: España e Italia. Nuestros resultados concuerdan con estudios empíricos anteriores, que sugieren que el corte emocional es un fuerte predictor del ajuste relacional. El uso del análisis de invariancia ofrece una base p