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Background: Subgroups of individuals sharing similar patterns of postpartum depression (PPD) among Chinese women are unknown thus far. Using a group-based trajectory model, this study aimed to explore the subgroups of Chinese primiparous women that share similar patterns of PPD and to explore the predictors of PPD trajectory membership over the course of the first six months postpartum. Methods: In total, 674 first-time Chinese mothers were recruited, and their depression status was assessed using the Edinburgh Postnatal Depression Scale (EPDS) at four time points. Findings: Around 18.0% of participants belonging to Group 1 labeled as "few or no symptoms" remained stable, with an EPDS score of less than 5 during a six-month postpartum period. Almost one-third of subjects fell within the second trajectory, labeled "subclinical but present symptoms", and peaked into the range of mild PPD but mostly stayed in the minimal range and had few or no PPD symptoms. Group 3 included 31.2% of women labeled "minor PPD status", and their mean EPDS scores increased to a peak of 14.66 at six weeks postpartum. Group 4, with "major PPD status", comprised 19.2% of the population, and the mean EPDS scores dramatically increased, reaching a peak of 19.59 at 12 weeks postpartum. Fewer types of support and not attending parenting training were associated with membership in the minor and major PPD status trajectories. Conclusions: Almost half of the Chinese new mothers in the study were found to fall into the two groups with minor or major PPD status trajectories, who should be given more attention and awareness from health professionals and researchers. Understanding predictors of group membership could help health providers to identify folks to prioritize getting connected to care as well as forming targeted interventions. Less degree of received support and not attending parenting training were identified to predict PPD trajectory membership. The regular, routine screening of PPD should be conducted at least 12 weeks postpartum, especially for new mothers in the major PPD status trajectory. [ABSTRACT FROM AUTHOR]

China has the largest population of floating rural-to-urban women worldwide, most of whom are of childbearing age. However, few studies have been conducted to monitor the changing trends in parenting outcomes, mental health and social support for these women in the early postpartum period. In this quantitative longitudinal study, 680 primiparous women among the floating population were recruited in Shenzhen, China. Face-to-face collection of socio-demographic questionnaires was completed by researchers in maternity wards on the third postnatal day. Follow-up electronic questionnaires were dispatched to women via email or WeChat at 6 weeks and 12 weeks following childbirth, including the Self-efficacy in Infant Care Scale (SICS), Edinburgh Postnatal Depression Scale (EPDS) and Postnatal Social Support Scale (PSSS), to measure maternal self-efficacy (MSE), postpartum depression (PPD) and social support, respectively. The mean scores of MSE for these floating women were 67.16 (14.35) at 6 weeks postpartum and slightly increased to 68.71 (15.00) at 12 weeks postpartum. The mean scores of EPDS remained almost stable, from 11.19 (4.89) to 11.18 (5.34) at the two time points. The prevalence of mild and severe PPD among floating women at 6 and 12 weeks after childbirth decreased from 54.4% to 40.1% and from 50.6% to 35.4%, respectively. The mean score of social support was 37.04 (10.15) at 6 weeks postpartum and slightly improved to 38.68 (10.46) at 12 weeks postpartum. Primiparous women among the rural-to-urban migrant population had an obviously negative status of parenting outcomes and mental health; and there was a lack of social support after childbirth. In future, tailored evidence-based interventions are highly needed to promote floating women's parenting outcomes, mental wellbeing and social support in the early stages of motherhood. As a higher-risk group of PPD, primiparous women among the floating population require effective and accessible mental health care after childbirth, such as early PPD screening and timely therapeutic methods. [ABSTRACT FROM AUTHOR]