3.1. Disposition and Demographics
RECRUITMENT
The recruitment period of the observation study was from November 2015 to June 2017. Among the 321 participants initially enrolled, 14 were excluded because they were multiparous or with multiple pregnancies or declined to participate in the study. Another 89 were excluded because they did not participate in the mental health assessment. The data from the remaining 218 participants were analyzed. The recruitment period of the interventional study was from July 2017 to April 2019. A total of 250 participants were enrolled and then randomly assigned to the perilla oil group (In the case–control study, 95 participants without blood samples were eliminated, and the remaining 123 participants were divided into cases (Because the participants for both the interventional and case–control studies were recruited by the same center, and the recruitments for those studies were carried out in sequence, the basic characteristics of participants in both studies were largely the same.