Effects of a postpartum depression intervention: subgroup analyses from a cluster randomized trial

Area of Science:

• Perinatal mental health research
• Clinical intervention effectiveness
• Health disparities in maternal care

Background:

• Postpartum depression (PPD) interventions require subgroup analysis for tailored efficacy.
• Limited research exists on how PPD interventions perform across diverse participant groups.
• Understanding subgroup effects is crucial for optimizing maternal mental health support.

Purpose of the Study:

• To examine the effectiveness of the Mothers and Babies (MB) PPD preventive intervention across participant subgroups.
• To investigate interaction effects between participant characteristics and the MB intervention on depressive symptom trajectories.
• To identify specific subgroups that may benefit more or less from the MB intervention.

Main Methods:

• A cluster-randomized trial involving 629 pregnant women was conducted.
• Participants completed the Quick Inventory of Depressive Symptomatology (QIDS) at baseline, post-intervention, and 12/24 weeks postpartum.
• Linear mixed models analyzed symptom changes, focusing on subgroup interactions and study arm effects.

Main Results:

• Racial and ethnic minority participants showed greater mean QIDS score decreases compared to non-minorities (p=0.048).
• First-time mothers receiving the MB intervention had lower mean QIDS scores at 24 weeks postpartum than multiparous mothers (p=0.028).
• No significant differences in symptom trajectories were observed for language or education subgroups.

Conclusions:

• The MB intervention demonstrates potentially greater benefits for racial/ethnic minorities and first-time mothers.
• Findings suggest tailoring MB intervention delivery to enhance its impact on specific maternal subgroups.
• Future research should explore organizational and system-level factors influencing intervention outcomes.