Ten-year trajectories of postpartum depression of Japanese mothers and fathers

Perinatal depression is a significant concern affecting both women and men during pregnancy and postpartum periods. While maternal postpartum depression has been extensively studied, paternal depression remains under-researched despite its prevalence and impact on family well-being. This study aimed to estimate the trajectories of perinatal and postpartum depression in Japanese parents over ten years and to determine the details of the symptoms of postpartum depression for each trajectory group, considering reciprocal effects between maternal and paternal depression.

A total of 789 couples used the Edinburgh Postnatal Depression Scale to rate their depressive symptoms prenatally; at 5 weeks, 3 months, 6 months, and 1 year postpartum; and then yearly thereafter until the 10th year. Parallel-process latent class growth analysis was used to group participants according to their longitudinal patterns of depressive symptoms.

For both mothers and fathers, four depressive symptom trajectories fit the data best and were most informative (escalating: 6.5 %; mothers low and fathers moderate: 17.2 %; mothers high and fathers low: 17.9 %; low: 58.4 %). A variance analysis showed significant class-parent interactions across anhedonia, anxiety, and depression subscales, indicating distinct patterns of depressive symptomatology.

Tailored mental health programs and universal screening using the Edinburgh Postnatal Depression Scale are recommended to address the specific needs of each trajectory class. This study contributes to the understanding of long-term depressive symptom trajectories in parents and emphasizes the necessity of comprehensive support strategies to enhance family well-being and resilience.