Brief Sub scales of the Edinburgh Postnatal Depression Scale
The Edinburgh Postnatal Depression Scale explores-2 distinct domains of negative affect: depressive symptoms and anxiety. Three sub scales were examined as brief alternatives to the 10-item Edinburgh Postnatal Depression Scale: the 3-item anxiety sub scale (Edinburgh Postnatal Depression Scale explores-3), the 7-item depressive symptoms sub scale (Edinburgh Postnatal Depression Scale-7), and 2 questions that resemble the Patient Health Questionnaire-2 (Patient Health Questionnaire--2) (Edinburgh Postnatal Depression Scale-2) (Supplemental Table 5). The US Preventive Services Task Force recommends using the Patient Health Questionnaire-2 as a depression screen among adults in primary care settings. The Patient Health Questionnaire-2 is derived from the longer Patient Health Questionnaire-9, which is a validated diagnostic measure of depression severity among adults. The Patient Health Questionnaire-2 consists of 2 questions focusing on depressed mood and anhedonia. To compare across scales, we compensated for the items that were removed by multiplying sub scale scores by a constant 10 divided by the number of sub scale items. Therefore, the screening cutoff score was 10 for the Edinburgh Postnatal Depression Scale and the 3 sub scales