Bidirectional or unidirectional? Longitudinal associations between external stressors, perceived spousal support, and marital instability.

Based on three annual waves of data from 268 Chinese newlyweds (Mage = 29.59, SD = 3.25 for husbands; Mage = 28.08, SD = 2.51 for wives), the present study examined the bidirectional associations between external stressors, perceived spousal support, and marital instability by using a three-wave, cross-lagged approach. Results indicated bidirectional associations between external stressors and marital instability, and a unidirectional association linking marital instability to perceived spousal support. Additionally, external stressors at Wave 2 mediated the association between external stressors at Wave 1 and marital instability at Wave 3. Taken together, the present study contributes to an emerging body of research aimed at clarifying: (a) the directionality of the associations between external stressors, perceived spousal support, and marital instability; (b) how external stressors cumulatively affect the development of marital instability. Our study extends the Vulnerability-Stress-Adaptation (VSA) model and has developmental implications for promoting marital relationships in non-Western couples.