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Obstetrics & Gynecology:
doi: 10.1097/AOG.0b013e318250ba48
Original Research

Reducing Postpartum Depressive Symptoms Among Black and Latina Mothers: A Randomized Controlled Trial

Howell, Elizabeth A. MD, MPP; Balbierz, Amy MPH; Wang, Jason PhD; Parides, Michael PhD; Zlotnick, Caron PhD; Leventhal, Howard PhD

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Author Information

From the Departments of Health Evidence & Policy, Obstetrics, Gynecology, and Reproductive Science, and Psychiatry, Mount Sinai School of Medicine, New York, New York; the Department of Psychiatry and Human Behavior, Warren Alpert Brown Medical School, and Women and Infants Hospital, Providence, Rhode Island; and the Institute for Health, Health Care Policy and Aging Research and Department of Psychology, Rutgers, the State University of New Jersey, New Brunswick, New Jersey.

Supported by the National Institute on Minority Health and Health Disparities (5P60MD000270-10) and the National Institute of Mental Health (5R01MH77683-2).

Presented at Society of General Internal Medicine 34th Annual Meeting, May 4–7, 2011, Phoenix, Arizona.

Corresponding author: Elizabeth A. Howell, MD, MPP, Department of Health Evidence & Policy, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1077, New York, NY 10029-6574; e-mail: elizabeth.howell@mountsinai.org.

Financial Disclosure Pfizer supplies medication for an National Institutes of Health-funded study on the treatment of postpartum depression, which is led by Dr. Zlotnick. The other authors did not report any potential conflicts of interest.

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Abstract

OBJECTIVE: To estimate the effectiveness of a behavioral educational intervention to reduce postpartum depressive symptoms among minority mothers.

METHODS: We recruited 540 self-identified black and Latina mothers during their postpartum hospital stay and randomized them to receive a behavioral educational intervention or enhanced usual care. Those in the intervention arm received a two-step behavioral educational intervention that prepares and educates mothers about modifiable factors associated with symptoms of postpartum depression (physical symptoms, low social support, low self-efficacy, and infant factors), bolsters social support, enhances management skills, and increases participants' access to resources. Enhanced usual care participants received a list of community resources and received a 2-week control call. Participants were surveyed before randomization and, 3 weeks, 3 months, and 6 months later to assess depressive symptoms. The primary outcome, depression, was assessed using the Edinburgh Postnatal Depression Scale (score of 10 or greater).

RESULTS: Positive depression screens were less common among intervention compared with enhanced usual care posthospitalization: 3 weeks (8.8% compared with 15.3%, P=.03), 3 months (8.4% compared with 13.24%, P=.09), and 6 months (8.9% compared with 13.7%, P=.11). An intention-to-treat repeated-measures analysis for up to 6 months of follow-up demonstrated that mothers in the intervention group were less likely to screen positive for depression compared with enhanced usual care (odds ratio 0.67, 95% confidence interval [CI] 0.47–0.97; number needed to treat 16, 95% CI 9–112).

CONCLUSION: An action-oriented behavioral educational intervention reduced positive depression screens among black and Latina postpartum mothers.

CLINICAL TRIAL REGISTRATION: Clinicaltrials.gov, www.clinicaltrials.gov, NCT01312883.

LEVEL OF EVIDENCE: I

Symptoms of depression postpartum are a major health problem and affect hundreds of thousands of American mothers annually.14 Experiencing these symptoms after childbirth has a negative effect on maternal quality of life and ability to function.5,6 In addition, untreated postpartum depression has an adverse effect on maternal–infant interaction that negatively affects infants' cognitive, social, and emotional development.710 The burden of postpartum depressive symptoms is especially high in low-income black and Latina women.3,11,12

Prior research by us and others suggests that a range of situational factors such as postpartum physical symptoms, overload from daily demands, and poor social support play a major role in the generation of depressive symptoms.3,1315 Based on these findings, we created a behavioral educational intervention aimed at reducing the frequency of depressive symptoms in postpartum mothers by preparing women about specific situational triggers of depressive symptoms, bolstering their personal and social resources, and suggesting specific actions to enhance their self-management skills to buffer postpartum demands. The intervention was aimed at prevention of depressive symptoms, not treatment of major depression. The primary outcome was the reduction of positive postpartum depression screens among black and Latina mothers randomized to the intervention arm.

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PATIENTS AND METHODS

Participants included 540 self-identified black and Latina postpartum mothers who delivered between April 2009 and March 2010 at a large tertiary inner-city hospital located in East Harlem in New York City. The Program for the Protection of Human Subjects (the institutional review board) at Mount Sinai School of Medicine approved this study. The patient sample was identified through an electronic documentation system for the labor and delivery unit. Eligible participants were black or Latina, aged 18 years or older, and had neonates with birth weights of 2,500 g or higher and 5-minute Apgar scores of 7 or greater. Maternal race, ethnicity, and age and neonatal Apgar scores and birth weight are contained in the electronic system.

To ensure eligibility, two bilingual clinical research coordinators asked additional questions of mothers who met initial requirements from the electronic record.

Final eligible mothers self-identified as black (or African American) or Latina (or Hispanic), spoke English or Spanish, and had a working telephone. The clinical research coordinators approached mothers between their delivery day and postpartum day 2 (recruitment was done Mondays through Fridays). Patients were assigned a number between 1 and 20 in order of delivery date and time and then approached in the order set by that day's list of random numbers generated by the project statistician. Our study team recruited between 12 and 14 patients per week.

After obtaining informed written consent, enrolled participants completed a 20-minute baseline in-hospital survey. Patients were randomized to conditions in four stages. The statistician carried out randomization using a computerized procedure that used a random number generator to assign participants to intervention or enhanced usual care. At the end of each stage, the randomization allocation could be potentially adjusted based on important covariates (eg, race or ethnicity, Edinburgh Postnatal Depression Scale score). No adjustment to randomization was initiated at any time. The research clinical coordinators were blinded to study arm assignment.

Patients randomized to the intervention arm were given a two-step behavioral educational intervention. The in-hospital component of the intervention involved a 15-minute, in-hospital review of a patient education pamphlet and partner summary sheet by the mother with a Masters-trained bilingual social worker. The pamphlet represented each potential trigger of depressive symptoms as a “normal” aspect of the postpartum experience and provided specific suggestions for management. For example, the prevalence of moderate or heavy vaginal bleeding immediately postpartum was depicted by eight of 10 female silhouettes colored red; only one of 10 was red 3 months postdelivery. Simple “to do” statements (rest; use pads) were listed between the two rows of figures. Postpartum and 3-month rates and intermediate “to do” lists also were provided for cesarean delivery site pain, episiotomy site pain, urinary incontinence, breast pain, back pain, headaches, hair loss, hemorrhoids, feeling sad and blue or depressive symptoms, and infant colic. A separate page was dedicated to social support and “helpful organizations” were listed. The partner summary sheet spelled out the typical pattern of experience for mothers postpartum, ie, it was designed to “normalize” the feelings and behaviors experienced and enacted by most mothers postpartum and stressed the importance of social support for the patient. The social worker reviewed the patient education pamphlet and partner summary sheet with the patient during her postpartum hospital stay and answered questions.

The second and final component of the intervention was a 2-week postdelivery call in which the social worker assessed patients' symptoms, skills in symptom management, and other needs. The “to do” lists to help alleviate symptoms were reviewed when needed and the patient and social worker created action plans to address current needs including accessing community resources. Fidelity of the intervention was maintained by repeated training and review of scripts for both the in-person in-hospital and telephone components of the intervention. Approximately 5% of both in-hospital sessions and 2-week telephone needs assessments were observed by a physician or project manager on the team.

The content of the intervention was based on responses from our prior studies, focus groups with postpartum mothers, obstetricians, psychiatrists, social workers, and our community action board. The intervention was pilot-tested with 50 diverse postpartum mothers and revised based on feedback from pilot study participants, the results from two focus groups conducted with black and Latina postpartum mothers, and feedback from community action board members (community representatives from Harlem). Content, pictures, wording, and length were revised according to input from these sources. Materials were translated to Spanish and back-translated for accuracy and consistency of meaning.

Enhanced usual care patients received routine postpartum hospital education (ie, discharge materials, television educational programs on infant care, breastfeeding, and peripartum care). To ensure equivalent contact, patients assigned to enhanced usual care control received a 2-week postdelivery call to inform them of future surveys and a list of health-related and community resources was mailed to them.

Interviewers were blinded to study arm assignment. All study participants were interviewed by phone at 3 weeks (mean 27.6 days, standard deviation [SD] 5.8; median 27 days, range 20–52 days), 3 months (mean 83.5 days, SD 7.8; median 81 days, range 76–124 days), and at 6 months (mean 175.6 days, SD 8.9; median 174 days, range 165–218 days) to assess depressive symptoms and contributing and buffering factors. Postnatal depressive symptoms were assessed using the 10-item Edinburgh Postnatal Depression Scale. The Edinburgh Postnatal Depression Scale is a common measure used in research to assess symptoms of postpartum depression in both treatment and prevention trials and has been validated in many postpartum populations and different languages.1629 The recommended cutoff score of 10 or greater has sensitivities of 0.59–0.81 and specificities ranging from 0.77 to 0.88 for major and minor depression.2 The Patient Health Questionnaire-9 was also administered and a comparison was made between the Edinburgh Postnatal Depression Scale and the Patient Health Questionnaire-9 scores over time in a secondary analysis. Survey items also included questions on sociodemographics, clinical characteristics such as antepartum complications, comorbid conditions (eg, diabetes, hypertension, asthma, thyroid disease, heart disease), depression history, anxiety, social support, and health care factors. Medical charts were reviewed for parity, delivery type, insurance, medical history, maternal complications, delivery complications, and infant outcomes.

After patients were consented and completed the baseline survey, women reporting high levels of depressive symptoms (Edinburgh Postnatal Depression Scale of 13 or greater, Patient Health Questionnaire-9 of 20 or greater, or suicidal ideation) were referred for inpatient psychiatric assessment and possible treatment. To address risk over time, all mothers, including those referred for inpatient assessment at baseline, were retained in the study, and mothers who reported high levels of depressive or suicidal symptoms at any time point were referred for psychiatric assessment and treatment. Analyses excluding mothers referred for baseline psychiatric intervention during hospitalization were planned a priori.

Sample size was powered to detect a clinically meaningful difference in reduction of symptoms of postpartum depression 3 weeks postrandomization for women in the intervention arm in comparison with women in enhanced usual care. Assuming that 46% of black and Latina women would report depressive symptoms (Edinburgh Postnatal Depression Scale of 10 or greater) in enhanced usual care (based on published literature and our studies of postpartum depressive symptoms among inner-city black and Latina mothers3,4), our recruitment target of 460 patients (230 per arm) met 90% power based on a two-sided .05 level χ2 test to detect a clinically meaningful 15% reduction in depressive symptoms (from 46% to 31%, a relative risk reduction of approximately 33%). To allow for decreased power resulting from patient loss at follow-up, we planned to enroll 540 participants.

Data were collected in person at baseline and by telephone during follow-up interviews by bilingual clinical research coordinators blinded to intervention status. All data were entered directly into a laptop computerized instrument linked to a Microsoft Access database. Participants in the intervention arm (n=270) and enhanced usual care (n=270) were compared at baseline on demographic and clinical characteristics using t tests and their nonparametric equivalents, χ2 tests, as appropriate. Group differences were summarized by 95% confidence interval estimates. Overall study attrition rate was low and equivalent across treatment groups. The amount of missing data for our primary outcome measure, Edinburgh Postnatal Depression Scale, was low at 3 weeks (13% [71 of 540]), 3 months (12% [62 of 540]), and 6 months (22% [117 of 540]) and similar between groups at each time point.

The primary analysis examined the efficacy of the intervention in reducing the likelihood of positive postpartum depression screens. Planned subgroup analyses examined whether the intervention reduced the likelihood of a positive depression screen among mothers who scored below 13 on the Edinburgh Postnatal Depression Scale and were therefore not referred for baseline psychiatric intervention. Before conducting these analyses, missing data were imputed, ie, estimated using a multiple imputation approach.30 Data were assumed to be missing at random because baseline characteristics for those missing outcomes at 3 weeks were very similar to those for whom outcomes were available at 3 weeks with the only significant differences (P<.05) being that those with missing outcomes were more likely to be born in the United States, to speak English, and have a history of depression. The regression models used baseline Edinburgh Postnatal Depression Scale scores and depression history. Five complete data sets were created using multiple imputations and analyzed and combined using the MIANALYZE procedure in SAS. The final parameter estimate and the associated standard errors account for both within- and between-imputation variance. Because imputation yielded similar results to the observed trial results both for the total sample and the subgroup analysis including the mothers not referred for intervention (92% of the sample), we present observed results, the more conservative estimate of effect, for both. The logistic regression analyses tested the effect of the intervention on positive depression screens at 3 weeks, 3 months, and 6 months postpartum. We conducted adjusted analyses for the subgroup of mothers not referred for treatment at baseline. We included independent variables that were associated with a positive depression screen at baseline. To assess change over time across groups for the primary outcome, mixed-effects models using maximum likelihood procedures were used. A significance level of .05 was used for the primary outcome of postpartum depression and the final model was adjusted for baseline depression screen.

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RESULTS

Of the 5,968 women who delivered over the study period, 1,528 (25.6%) met the initial eligibility criteria (eg, were black or Latina, 18 years old or older). A total of 668 (43.7%) of the 1,528 eligible mothers were approached in the hospital and reviewed the study consent form. Of the 668 mothers, 540 (80.8%) completed the consent process and were enrolled in the trial and 128 (19.2%) mothers declined to participate (Fig. 1). There were no significant differences between those who consented or declined in mean age, insurance status, primary language, or delivery route. Latina mothers were more likely to decline (P<.05) than black mothers. Of the 270 mothers randomized to the intervention arm, 261 received the intervention in the hospital, although nine mothers were discharged before the social worker could meet with them. Those nine patients were sent the education materials and the social worker reviewed the educational materials over the phone. Ninety-three percent (250 of 270) of the intervention group and 93% (251 of 270) of the control group were successfully reached for the 2-week calls. Of the 540 enrolled patients, nine patients withdrew over the 6-month study period. Completion rates for the follow-up interviews were 87% (468 of 540) at 3 weeks, 89% (478 of 540) at 3 months, and 78% (423 of 540) at 6 months. Follow-up was equivalent for intervention and control at 3 weeks (84.4% compared with 88.9%, P=.09), 3 months (87.8% compared with 89.3%, P=.59), and 6 months postpartum (79.3% compared with 77.4%, P=.06). There were no baseline differences in rates of positive depression screens between women lost to follow-up compared with those included in the analyses at 3 weeks (19% compared with 15%, P=.28), at 3 months (18% compared with 15%, P=.55), or at 6 months (18% compared with 14%, P=.35).

Fig. 1
Fig. 1
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The overall mean age of enrolled participants was 28 years (range 18–46 years); 62% were Latina and 38% were black, 63% had Medicaid insurance, 56% earned $30,000 or less annually, 35% were foreign-born, and 21% spoke Spanish as their primary language. Baseline characteristics of the intervention and control groups are described in Table 1. There were no clinically important differences between the two groups at baseline except that comorbid conditions were more prevalent among the controls than the intervention group (27% compared with 20%, P=.05). The mean Edinburgh Postnatal Depression Scale scores at baseline were 4.2 (SD 4.6) in the intervention group and 4.5 (SD 4.9) in the control group. Forty-five mothers (20 in the intervention group and 25 in the control group) had high levels of depressive symptoms at baseline and were referred for psychiatric assessment or possible treatment while in the hospital.

Table 1
Table 1
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In the intention-to-treat analysis (n=540), mothers in the intervention arm were less likely to screen positive for depression than mothers in the control arm: at 3 weeks, 8.8% (20 of 227) compared with 15.3% (37 of 242; P=.03), respectively; at 3 months, 8.4% (20 of 237) compared with 13.2% (32 of 242; P=.09), respectively; and at 6 months, 8.9% (19 of 214) compared with 13.7% (29 of 211; P=.11), respectively. Repeated-measure analysis showed that the intervention was protective against a positive depression screen for up to 6 months of follow-up (odds ratio [OR] 0.67, 95% confidence interval [CI] 0.47–0.97; number needed to treat 16, 95% CI 9–112).

Subgroup analyses were planned to estimate the effect of the intervention on mothers not referred for baseline psychiatric assessment and treatment because this intervention was aimed at prevention, not treatment of mothers with severe depressive symptoms. Analyses of the 495 mothers who did not receive an additional psychiatric intervention at baseline showed that mothers in the intervention arm were less likely to screen positive for depression than mothers in the control arm at 3 weeks (7.1% compared with 14.4%, P=.01), 3 months (6.3% compared with 11.4%, P=.058), and 6 months (7.5% compared with 13.1%, P=.068) (Table 2). In multivariable analyses controlling for baseline depression scores, history of depression, country of birth, language, social support, and presence of comorbid clinical condition, mothers in the intervention arm compared with. controls were less likely to screen positive for depression at 3 weeks (adjusted OR 0.37, 95% CI 0.17–0.79), at 3 months (adjusted OR 0.45, 0.21–0.92), and at 6 months (adjusted OR 0.51, 0.24–1.07). Repeated-measure analysis showed that the intervention was protective against a positive depression screen score for up to 6 months of follow-up (OR 0.57, 95% CI 0.37–0.88) among mothers not referred for psychiatric intervention at baseline. Among the 45 mothers referred for psychiatric assessment and treatment at baseline, there was no significant difference between intervention and control in rates of positive depression screens at 3 weeks, 3 months, and 6 months postpartum.

Table 2
Table 2
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DISCUSSION

The results of this trial suggest that a behaviorally focused, educational intervention, delivered in the obstetric setting has the potential to reduce the likelihood of a positive depression screen among black and Latina mothers. Our intervention, designed to address modifiable, situational factors for the prevention of postpartum depression, was successful in buffering the occurrence of such symptoms; both intent-to-treat analysis and subgroup analysis of mothers not referred for psychiatric intervention at baseline demonstrated that mothers randomly assigned to the intervention were less likely to screen positive for depression during the 6-month follow-up period than mothers in enhanced usual care. We believe the significantly lower odds of reporting symptoms indicating a positive screen for depression during the 6 months of follow-up as compared with controls is clinically important because many of the detrimental effects of postpartum depression affect mothers, infants, and families during this crucial period. Given our success in recruiting 540 black and Latina mothers with only a 19% refusal rate, our results are likely representative for mothers from similar racial and socioeconomic backgrounds.

The effect of our intervention appeared somewhat stronger among the 495 mothers not referred for psychiatric assessment and possible treatment at baseline. Because the intervention was designed to prevent and not to treat depressive symptoms and those referred were given a potentially stronger personalized assessment and treatment, a behavioral education intervention was unlikely to provide added benefit. For ethical reasons, we decided to continue to include, assess, and refer for formal assessment and treatment any mother who exceeded the highest cut point (Edinburgh Postnatal Depression Scale score of 13 or higher, a Patient Health Questionnaire-9 score of 20 or higher, or suicidal ideation) at any point in time. However, our data do suggest that in settings where mothers are not screened before hospital discharge, the evidence suggests that this intervention shows promise for reducing positive depression screens in the early postpartum period.

Our results suggest that one can address and modify the factors that have been reported to be correlated with and hypothesized to elicit postpartum depressive symptoms.3,15 Our intervention aimed to increase mothers ' knowledge about specific triggers of postpartum depressive symptoms by presenting visual displays of the number of mothers likely to experience each symptom, providing simple “to do's” to manage each symptom, and was followed by a visual display of the number of mothers likely to still experience these factors at 3 months. The visual representations made clear that these factors were “normal,” manageable with behavioral strategies and tactics, and likely remediated in a defined timeframe. It also emphasized the importance of social support. Finally, specific instructions specified to call one's physician in the event that symptoms did not resolve or worsened and provided a list of existing health-related community services. Although our study is one of few trials that have successfully reduced postpartum depressive symptoms among black and Latina mothers, our results are consistent with a large Cochrane review, which demonstrated that psychosocial interventions to prevent postpartum depression are more likely to be successful if they are individually based, initiated postnatally, and conducted by a health professional.31 Psychoeducational interventions may be especially helpful in the setting of prevention because they avoid some of the stigma associated with mental illness, which is of particular importance for many black and Latina communities.

There were limitations with this trial. First, the rate of positive depressive symptom screens was much lower than rates previously published in the literature on perinatal women of color.3,32 Previous studies have rates as high as 50% depending on the screening instrument used and population studied.3,4 Given that the prevalence of depressive symptoms was much lower than expected, our power to detect a meaningful difference was extremely limited in this study. Despite the low prevalence of depressive symptoms in this patient sample, the intervention was found to be effective. Second, we used a depression screening instrument rather than a formal structured interview to diagnose depression. Our intervention was implemented in an obstetrics setting where formal assessments are often too burdensome to perform. Furthermore, positive screens for depression, whether or not they are associated with a diagnosis of major depressive disorder, are associated with multiple negative outcomes for mothers and infants.3,5,13,32 Finally, our trial was implemented in one institution, which limits the generalizability of our results. However, the institution serves a very racially, ethnically, and socioeconomically diverse population in a large urban city. Future research should examine the effect of this intervention more broadly (in multiple settings) and this intervention has the potential to be adapted to an outpatient setting.

A behavioral educational intervention, reviewed and modified by mothers and community members, delivered to black and Latina postpartum mothers successfully reduced the likelihood of a positive depression screen in a large urban hospital setting. This first-step intervention focuses on educating and preparing mothers for postpartum experiences and increasing their ability to cope with postpartum demands. Although this intervention does not replace treatment for major depression and may be of limited benefit for those with major depression, it successfully reduced positive postpartum depression screens among low-income mothers of color in this study. It is important to note that the effect during the first 6 months postpartum would likely benefit the infant, mother, and family.

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