Development trajectories of marital satisfaction and postpartum depression: a longitudinal study.

The moderating effect of monthly household income was highly significant (χ 2 = 12.37, P = 0.002) and displayed a clear dose-response pattern: the lower the income, the stronger the negative association (low-income group β = –0.58, high-income group β = –0.27).

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On the other hand, postpartum depression showed a trend of initially increasing and then decreasing ( S = 0.92, P = 0.005), peaking at 6 weeks postpartum (9.23 points) and slightly declining by 12 weeks (8.67 points).

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