Abstract
Perinatal depression (PND) is a major depressive episode during pregnancy or within 4 weeks after childbirth up to a year. Risk factors for PND include stressful life events, history of depression, poor social support, unplanned and unwanted pregnancies, poor relationship quality, current or previous abuse, and low socioeconomic status. This mental disorder has been shown to have negative effects on mothers' quality of life and their intimate relationships, birth outcomes, and breastfeeding likelihood, as well as long-term effects on children's cognitive and emotional development. To date, no nationally representative study has examined whether there are socioeconomic and/or racial/ethnic differences in PND. This study discusses the prevalence and risk factors for PND, as well as its health consequences for mothers and children, the reasons for its underreporting and undertreatment, the evidence for different screening instruments and different treatment options, and the existing supportive policies to address this disorder in the United States. We conclude with outlining next steps in addressing the gaps in the literature on PND.
Keywords: perinatal depression, racial/ethnic differences, underreporting/undertreatment, supportive policies
Introduction
The perinatal period, an important transition to motherhood, represents a vulnerable time for developing mental health disorders, including perinatal depression (PND).1 PND is defined in the Diagnostic and Statistical Manual of Mental Disorders-5th edition (DSM-5) as the occurrence of a major depressive episode during pregnancy [antenatal depression (AND)] or following childbirth [postpartum depression (PPD)], with use of the “with peripartum onset” specifier for depressive disorders (onset during pregnancy or within 4 weeks after delivery).2 PND should not be confused with the “postpartum blues,” which is a commonly experienced state of fluctuating mood, fatigue, tearfulness, irritability, and feelings of anxiety that generally resolves within the 10–14 days following delivery.1
Although biological factors may influence mood in the early postpartum recovery period, growing evidence indicates that an accumulation of psychological stressors in the 1st year after delivery also contributes to the onset or recurrence of depressive episodes.3 Symptoms of depressive disorders include depressed mood, loss of energy and/or interest in daily activities, sleep problems or appetite/weight changes, poor concentration, feelings of worthlessness, guilt and/or hopelessness, and suicidal thoughts. For a major depression diagnosis, five or more specific symptoms must be present for at least 2 weeks, one of which must be depressed mood or loss of interest.2 By strict DSM-5 standards, depressive episodes that occur beyond the 4-week period after delivery are classified as a depressive disorder without the peripartum modifier. In practice, however, the prenatal period and up to 1 year postpartum is a risk period that is both critical to recognize and amenable to depression screening and treatment.4
Prevalence of Depression in the Perinatal Period
Depression is one of the most common serious complications of pregnancy. According to a 2005 national review, the prevalence of major and minor depression in the United States is 8.5%–11% during pregnancy and 6.5%–12.9% during the first postpartum year.5 A 2016 review that focused on longitudinal studies reported an average prevalence rate of 17% for AND and 13% for PPD; moreover, 39% of women who experienced AND went on to develop PPD.6
Some research evidence points to racial/ethnic differences in PND prevalence rates in the United States. A systematic review of racial/ethnic disparities in AND found that the overall prevalence was 10%–30% and was higher among African American and Hispanic women compared to white women.7 However, this review compared studies that used different designs, instruments, and settings, which limited generalizability. An analysis of 2018 data from the Pregnancy Risk Assessment Monitoring System found that the prevalence of self-reported PPD symptoms averaged 13.2% and was higher among American Indian/Alaska Native (22.0%), Asian/Pacific Islander (19.2%), and black women (18.2%) than among white women (11.4%).8 However, PPD symptoms were measured with the Patient Health Questionnaire-2 (PHQ-9) instrument, AND symptoms were not measured, and only 31 states were included. Studies also point to increased PND prevalence among low-income women. A recent review of the literature revealed mixed findings, in which some studies reported that up to 50% of low-income women experienced PND, while other studies that focused on women who received public assistance or used public-sector services reported 12-month depression rates of 12%–36%.9 None of these studies is nationally representative and they differ in designs, instruments, and settings; thus, any evidence regarding racial/ethnic and income differences in PND rates is inconclusive.
The coronavirus disease 2019 (COVID-19) pandemic caused by the novel coronavirus (SARS-CoV-2) is another factor to consider. Recently published data from China on the mental health impact of the COVID-19 outbreak show increased rates of antenatal10 and postpartum depressive symptoms among Chinese women.11 Similarly, a convenience sample of mothers in the United States of children 0–18 months of age showed elevated rates of depressive (34.1%) and anxiety (34.6%) symptoms.12 Thus, reassessment of PND prevalence rates and examination of immediate and long-term effects of the pandemic on these rates could be potential avenues for future research.
The aforementioned prevalence statistics mainly relied on self-reported depressive symptoms using different screening tools and sampling techniques and do not constitute nationally representative estimates of medical diagnoses of PND. A study of depression diagnoses during delivery hospitalizations that analyzed data from the National Inpatient Sample and 31 State Inpatient Databases found that depression rates were 28.7 per 1,000 (2.87%) in 2015.13 This showed a discrepancy between estimates of diagnosis rates and self-reported rates. Future research efforts could be geared toward examining the reasons behind this discrepancy and whether differences in PND diagnoses by race/ethnicity and income exist.
Risk Factors and Etiology of PND
Multiple risk factors have been associated with PND, including social, psychological, biological, and genetic factors.4 Systematic reviews of risk factors for AND found the following factors to be associated with higher likelihood of AND symptoms: life stress, depression history, maternal anxiety, lack of social support, lower frequency of exercise, unintended pregnancy, Medicaid insurance, intimate partner violence, child abuse history, lower income, lower education, smoking, single status, and poor relationship quality.14,15 Recent studies also showed associations between adverse childhood experiences and AND.16,17 Moreover, obese and overweight women had a higher likelihood of elevated AND symptoms than women with normal weights.18 Notably, the literature remains more extensive on PPD risk factors than on AND.
A 2014 review of the literature and existing meta-analyses revealed that the following factors have moderate to strong associations with PPD: history of depression, AND and antenatal anxiety, neurotic personality, low self-esteem, maternity blues, stressful life events, poor marital quality, and poor social support.19 Factors with smaller associations included low socioeconomic status, single marital status, unintended pregnancy, obstetrical stressors, and an infant with a difficult temperament.19 In addition, women who developed PPD appeared to be more sensitive to the neurobiological effects of the sudden drop in estradiol levels in the first few postpartum days; moreover, data from genome-wide association studies point to the possibility that genetic variations on specific chromosomes, such as chromosome 1q21.3–q32.1, could increase predisposition to PPD symptoms.19,20 A 2020 literature review added that the strongest two risk factors for PPD are AND and current domestic abuse.21 Finally, a meta-analysis of studies from 56 countries found that the global PPD prevalence was 17.7% and that 73% of the variation across countries can be explained by higher rates of income inequality, maternal mortality, infant mortality, or women working 40 hours a week.22
To summarize, the causes of PND are likely multifactorial. Future research studies could investigate whether a gene-environment interaction model can improve the specification of PND risk. That is, genes may provide a certain level of risk that can be exacerbated by environmental stressors, such as adverse life events, low socioeconomic status, and pregnancy complications.23 In addition, research examining whether certain factors may confer different risk levels across various racial/ethnic and income groups could enhance timely diagnosis and treatment for those at the highest risk.
Health Consequences to the Mother and Offspring
PND may present serious health consequences for both the mother and her offspring. AND has been associated with delayed fetal development, higher incidence of prematurity and low birth weight, and increased rates of such prenatal and perinatal complications as preeclampsia, placental abnormalities, and spontaneous abortion.15,24 Moreover, AND has been associated with poor maternal sleep, PPD, less exclusive breastfeeding, paternal depression, a lower Apgar score and Brazelton Neonatal Behaviour Assessment Scale at birth, infant sleep problems, perceptions of difficult infant temperament, and higher body mass index of the child, as well as a twofold increase in childhood mental disorders.15 PPD can have negative effects on maternal-infant bonding and interaction25; adaptation to the mothering role and confidence in providing infant care26; maternal quality of life and intimate relationships25; children's emotional, cognitive, and behavioral development27; and the father's mental health.28 Furthermore, some perinatal women who are depressed have an increased suicide risk. Estimates have shown that suicide may account for up to 20% of maternal mortality.29
Children whose mothers suffered from PND are at increased risk for significant developmental delays, such as lower levels of activity, fewer facial expressions, lower levels of attentiveness, and physiological changes characterized by elevated cortisol levels and decreased levels of dopamine and serotonin.30 Gaps in the current literature point to a dearth of longitudinal neurodevelopmental studies of children exposed to perinatal mental illness, with or without maternal use of psychotropics during pregnancy; few longitudinal studies to determine the mediating and moderating mechanisms through which PND exerts lasting effects on the child; and scant translational research on the potential role of the microbiome in mother–infant interaction and PND.31–34
Underreporting and Undertreatment of PND
In the United States, 50%–70% of women with AND or PPD are undetected and undiagnosed, and nearly 85% go untreated.31 These low detection and treatment rates may be due to several factors. First, PND can be difficult to assess during the clinical encounter due to the overlap of common somatic symptoms of pregnancy or such normal experiences of motherhood as fatigue or appetite changes with symptoms of depression.35,36 Second, routine screening for PND, which helps detect more cases than clinical judgment alone, is not standard practice in the United States.37 In addition, other patient-, provider-, and system-level barriers exist to addressing and treating PND, such as mental illness stigma, cultural factors, fear of side effects of antidepressants, limited access to mental health care, limited resources and mental health training among perinatal care providers, and low levels of coordination between perinatal and mental health professionals.38
The American College of Obstetricians and Gynecologists (ACOG) has recently recommended screening women for depression and anxiety symptoms at least once during the perinatal period, coupled with appropriate initiation of treatment and referrals to behavioral therapy when indicated and having systems in place that facilitate follow-up for diagnosis and treatment.39 This recommendation came after the U.S. Preventive Services Task Force updated its 2009 routine depression screening recommendations of the general adult population to include pregnant and postpartum women, while stipulating that “screening should be implemented with adequate systems in place to ensure accurate diagnosis, effective treatment, and appropriate follow-up.”40 This was a “Rating B Recommendation,” which implies high certainty that the net benefits of routine screening are moderate.40 Thus, increasing evidence supports the effectiveness of routine depression screening of women in the perinatal period.
Evidence for Different Screening Instruments and Different Treatment Options
Seven screening instruments have been validated for detecting PND during pregnancy and the postpartum period and have been deemed acceptable by the ACOG: the Edinburgh Postnatal Depression Scale (EPDS), Postpartum Depression Screening Scale, PHQ-9, Beck Depression Inventory, Beck Depression Inventory II, Center for Epidemiologic Studies Depression Scale, and the Zung Self-Rating Depression Scale.39 However, the EPDS remains the most frequently utilized instrument in clinical and research settings for several reasons, including its brevity (10 items that take <5 minutes to complete), its exclusion of constitutional symptoms that are common during pregnancy and the postpartum period—unlike all the other instruments, and its inclusion of the anxiety symptoms that are a prominent feature of perinatal mental disorders.39 The PHQ-9 is also brief, with nine items, including a suicide item, and is utilized in obstetric-gynecological settings.41 Although the aforementioned instruments have proven their reliability and validity,39 no consensus exists on the use of a standard instrument for PND screening.
Even though PND screening is important, it is not as effective without appropriate follow-up and treatment. Most studies have evaluated the effectiveness of psychological treatments for PND, such as interpersonal psychotherapy (IPT) and cognitive behavioral therapy (CBT); however, only a few studies have evaluated pharmacological treatments because pregnant and lactating women often are excluded from medication trials. In 2011, a meta-analysis of the efficacy of pharmacologic and psychological interventions found that IPT demonstrated higher effect sizes when compared to controls and was superior to CBT in PND treatment (higher effect sizes when compared to controls). The meta-analysis also showed that individual psychotherapy was superior to group psychotherapy when observing changes in symptoms from pretreatment to posttreatment.42 However, no conclusion was made regarding pharmacological treatments because there were too few studies.42 An updated 2018 meta-analysis showed that IPT was effective in reducing PND symptoms in both prevention and treatment studies.43 Another updated meta-analysis showed that CBT was effective in reducing depressive symptoms compared to control conditions in both prevention and treatment studies, and postpartum interventions were more effective than antenatal interventions in both types of studies.44 Moreover, prevention studies that had higher proportions of non-white, single, and multiparous participants showed greater reduction in depressive symptoms due to CBT.44 A recent review of the reproductive safety of pharmacological interventions concluded that certain antidepressants—such as selective serotonin reuptake inhibitors, serotonin-norepinephrine reuptake inhibitors, tricyclic antidepressants, and bupropion—are deemed safe for administering to pregnant and lactating women when used appropriately.45 However, the studies cautioned that double-blind placebo-controlled studies on these antidepressants do not exist.45
Complementary Health and Integrative Health Approaches for PND
Evidence suggests that many women inquire about and prefer to use complementary health approaches during pregnancy.46–48 These include “natural products,” such as dietary supplements, and mind and body approaches, such as yoga, acupuncture, and mindfulness. Reasons for use of these approaches include motivation to have greater control over childbearing experiences and concerns about the risks to their infants from using pharmaceuticals to treat depression.46,47,49 Indeed, pregnant women use multiple complementary health approaches and report perceptions that these approaches have some clinical benefit; however, health professionals often are not consulted before their use.46,47,50
Only preliminary evidence exists to indicate that complementary health approaches—such as folate supplementation (yet there are well-documented protective effects of folate against the development of neural birth defects51), yoga, and mindfulness—are safe, feasible, and acceptable for perinatal women and have the potential for improving depressive symptoms.48,52–55 These types of low-cost interventions can be important for women who have limited access to traditional treatment with psychotherapy.48,56 However, concerns have been raised about the use of these approaches for which the evidence for full efficacy and safety remains limited.49 Additional research involving more rigorous study designs with larger, diverse samples compared to more conventional psychotherapies and pharmacotherapies and research to understand the mechanisms of action of these approaches may help inform optimal dosing and efficacy of these approaches.48,52,55
Supportive Policies for PND
Supportive policies across the United States at the state and federal government levels provide insights for addressing the undue burden that PND puts on new mothers and their families.
At the state level, there have been numerous legislative developments over the past 15 years, the first being enacted in New Jersey in 2006.57 This law mandated PND screening and education by health care providers and required doctors to ask expectant mothers about their depression history. A study that evaluated this legislation, however, showed that it had no impact on PPD screening and treatment among mothers who are Medicaid recipients.57 Illinois and West Virginia passed similar screening and education laws in 2008 and 2009, respectively.58 Moreover, four states—Montana, Oregon, Texas, and Virginia—have passed legislation that requires mandatory education about PND for health care providers and informational materials for new parents about depressive symptoms and available resources.58 Notably, in 2012, Minnesota amended legislation to outline the eventual implementation of mandatory screening practices, which will require the Commission of Health to provide technical support to health care providers as screening becomes more widespread (Minnesota Statute §145.906).
At the federal government level, numerous bills have been introduced by Congress to increase federal support for PND prevention over the past 20 years. The first of these—the Melanie Blocker-Stokes PPD and Research Act, later renamed the MOTHERS Act—was first introduced in 2003 and then enacted in 2010 as part of the Affordable Care Act.59 This legislation allocated federal funds for public and nonprofit health care providers to enhance inpatient, outpatient, and home-based health and support services. The legislation also encouraged the U.S. Department of Health and Human Services to facilitate research into perinatal mood disorders and to launch a national awareness campaign.59 In addition, language from the MOTHERS Act was incorporated into the Patient Protection and Affordable Care Act Section 2952 (Support, Education, and Research for PPD), which authorizes grants to support the establishment, operation, and delivery of effective and cost-efficient systems for providing clinical services to women with, or at risk for, PPD or psychosis.
Research in the United States and other countries has shown that access to paid leave after childbirth is associated with better perinatal mental health.60 However, the United States is the only country in the industrialized world, and one of two countries among 185 (the other is Papua New Guinea), which does not have a national paid maternity leave law.61 Thus, women's access to paid leave is contingent on their employer's policy or the state they reside in. Currently, eight states and the District of Columbia have passed some form of paid leave policy.62 Evaluation of California's Paid Family Leave program showed that before this law was passed, African American women took on average 1 week of leave after childbirth compared to 4 weeks for white women; however, several years after the leave act was implemented, both groups averaged 7 weeks of leave.63 Moreover, this law was associated with a 29% reduction in mean psychological distress symptoms, the effects being most pronounced for black, single, and low-income women.64 On December 20, 2019, the President signed a new law, the Federal Employee Paid Leave Act, which provides 2.1 million federal workers with up to 12 weeks paid leave following childbirth, adoption, or fostering.
Conclusion
PND is a debilitating mental disorder with disruptive impacts on the health of mothers, fathers, and children. Preliminary evidence shows racial and ethnic differences in PND prevalence, which could be further explored using nationally representative studies and well-validated measures for PND, including medical diagnoses. Some understudied research areas include examination of racial/ethnic disparities in accessing PND screening and treatment services. In addition, future research efforts could both devise ways to conduct safe, rigorous studies of pharmacologic treatments for mental disorders in pregnant and lactating women and carefully explore the effectiveness of complementary health approaches in comparison to conventional therapies. Finally, more studies that evaluate the impact of existing policies on the mental health of perinatal mothers, including such underserved populations as racial/ethnic minorities and low-income women, are warranted.
Acknowledgments
We would like to acknowledge Dr. Cheryl Kassed for her helpful edits and feedback on this article.
Disclaimer
The views expressed in this article are those of the authors and do not necessarily reflect the official views of the National Institutes of Health, the Department of Health and Human Services, or the United States federal government.
Author Disclosure Statement
The authors have no financial conflicts of interest.
Funding Information
No funding was received for this article.
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