The nature and predictors of the trajectory of change in marital quality for husbands and wives over the first 10 years of marriage.

Four parameters of the trajectory of change in marital quality (initial status as well as linear, quadratic, and cubic patterns of change) were estimated for husbands and wives over the first 10 years of marriage (n = 522 couples at Year 1 and 93 couples at Year 10). Both husbands and wives started their trajectories of change at fairly high levels of marital quality and showed a cubic pattern of change such that marital quality declined fairly rapidly in the early years of marriage, stabilized, and then declined again. Whereas individual-differences variables predicted the initial status of the trajectory, husbands and wives living with only their biological children showed a steeper decline in marital quality than husbands and wives living without children or stepchildren.