PHQ-8 minor depression among pregnant women: association with somatic symptoms of depression

It was recently reported that pregnant women were more likely to have minor depression as measured by the Patient Health Questionnaire-8 depression scale (PHQ-8), (as reported by Kroenke and Spitzer (Psychiatr Ann 32(9):1–7, 2002), and Kroenke et al. (J Affect 114(1–3):163–173, 2009)) compared to women who were not pregnant (as reported by Ashley et al. (Arch Womens Ment Health 19(2):395–400, 2015)). The present study is designed to investigate if somatic symptoms (energy level, appetite, sleep) associated with both pregnancy and depression were responsible for this increased prevalence of minor depression. A sample of pregnant women (n = 404) was compared to women who were not pregnant (n = 6754). Both groups scored within the minor depression range on the PHQ-8 and comparisons were based on participants’ responses to PHQ-8 items. Results indicate that of the somatic symptoms of depression, only changes in energy level accounted for the elevated prevalence of minor depression among pregnant women compared to women who are not pregnant. Removing the decreased energy item from the score determination reduces the prevalence of minor depression among pregnant women to a level significantly below that of women who are not pregnant. Emotional symptoms such as feeling down and feeling like a failure were less likely to be reported by pregnant women compared to women who were not pregnant. Implications for depression screening during pregnancy are discussed.