Antenatal depression and its potential causal mechanisms among pregnant mothers in Gondar town: application of structural equation model

Abstract

Background: Various forms of life stressors have been implicated as causes of antenatal depression. However, there is a lack of understanding of which forms of stress lead to antenatal depression and through what mechanisms. Modeling stress processes within a theoretical model framework can enhance an understanding of the mechanisms underlying relationships between stressors and stress outcomes. This study used the stress process model framework to explore the causal mechanisms underlying antenatal depression in Gondar, Ethiopia.

Methods: Questionnaires, using an Online Data collection Kit (ODK) tool were administered face-to-face in 916 pregnant women in their second and third trimesters. Pregnant women were included from six randomly selected urban districts in Gondar, Ethiopia during June and August 2018. The Edinburgh Postnatal Depression Scale (EPDS) was used to screen for antenatal depression. A Structural Equation Model (SEM) was employed to explore the direct, indirect, and total effect of stressors and mediators of antenatal depression.

Result: Sixty-three participants (6.9%) reported symptoms of depression. Of these, 16 (4.7%) and 47 (8.1%) were in their second and third trimesters, respectively. The SEM demonstrated several direct effects on antenatal depression scores including unplanned pregnancy (standardized β = 0.15), having a history of common mental health disorder (standardized β = 0.18) and fear of giving birth to the current pregnancy (standardized β = 0.29), all of which were associated with a higher depression score. Adequate food access for the last 3 months (standardized β = - 0.11) was associated with decreased depression score. Social support (β = - 0.21), marital agreement (β = - 0.28), and partner support (β = -.18) appeared to partially mediate the link between the identified stressors and the risk of antenatal depression.

Conclusion: Both direct and indirect effects contributed to higher antenatal depression score in Ethiopian women. The three psychosocial resources namely marital agreement, social and partner support, mediated reduced antenatal depression scores. Early screening of antenatal depression and enhancing the three psychosocial resources would help to improve maternal resilience.

Keywords: Antenatal depression; Pregnant mothers; Stressor; Structural equation modeling.

Fig. 1

A stress process model, a theoretical frame work, adapted from Pearlin et al. 1981

Fig. 2

Measurement model for elucidating the stress process for antenatal depression (N = 916), Gondar town, Ethiopia, 2018

Fig. 3

Structural equation modeling for testing a stress process model for antenatal depression (N = 916), in Gondar town, Northwest Ethiopia