Psychometric assessment of the Edinburgh Postnatal Depression Scale in an obstetric population

Abstract

The prevalence and negative effects of perinatal depression are well known. The Edinburgh Postnatal Depression Scale (EPDS) is a common screening tool for perinatal depression and it is recommended for use by several professional organizations. The current study tested competing EPDS factor structures and assessed EPDS change from intake to 6-week follow-up, and identified demographic correlates in an outpatient obstetric sample. Using a retrospective observational study design, medical records were coded for demographic, mental health, and EPDS patient data (n = 524). Confirmatory factor analysis, t-tests, and ANOVA were utilized. Findings included: (1) a 3-factor model (i.e. anxiety, depression, anhedonia) of the EPDS displayed the best fit to the current data; (2) small declines in all 3 subscales of the EPDS from intake to 6-week follow-up appointments and; (3) demographic correlates of EPDS subscales included history of depression, history of anxiety, race, and pregnancy status (i.e. first child or not). The 3-factor structure can be used in clinical practice to assess perinatal depression in a nuanced fashion. Given that history of depression and anxiety are risk factors for perinatal depression, a thorough assessment of these items in clinical practice is needed.

Keywords: Anhedonia; Confirmatory factor analysis; Edinburgh Postnatal Depression Scale; Perinatal depression; Screening.