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RESEARCH AND PRACTICE |
Saifuddin Ahmed and Michael A. Koenig are with the Department of Population and Family Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Md. Rob Stephenson is with the Department of International Health, Rollins School of Public Health, Emory University, Atlanta, Ga.
Correspondence: Requests for reprints should be sent to: Saifuddin Ahmed, MBBS, PhD, Department of Population and Family Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, 615 N Wolfe St, #E462, Baltimore, MD 21205 (e-mail: sahmed{at}jhsph.edu).
| ABSTRACT |
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Objective. We examined the effect of physical violence during pregnancy on perinatal and early-childhood mortality.
Methods. We estimated the prevalence of domestic violence during pregnancy among a population-based sample of 2199 women in Uttar Pradesh, India. We used a survival regression model to examine the risks for perinatal, neonatal, postneonatal, and early-childhood (aged 13 years) mortality by mothers exposure to domestic violence, after we controlled for other sociodemographic and maternal health behavior risk factors.
Results. Eighteen percent of the women in our study experienced domestic violence during their last pregnancy. After we adjusted for other risk factors, births among mothers who had experienced domestic violence had risks for perinatal and neonatal mortality that were 2.59 (95% confidence interval [CI]=1.35, 4.95) and 2.37 (95% CI=1.21, 4.62) times higher, respectively, than births among mothers who had not experienced violence. We found no significant associations between domestic violence and either postneonatal or early-childhood mortality.
Conclusions. Domestic violence is a significant risk factor for perinatal and neonatal mortality.
| INTRODUCTION |
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The prevalence of domestic violence among pregnant women in US studies ranges from 1% to as high as 20%, with most studies reporting a range of 4% to 8%.16 Although more limited in number, studies that were conducted in developing countries have reported prevalence rates that range from 4% to as high as 28%.17 Infant mortality rates also are substantially higher in developing countries; today, more than 90% of neonatal deaths occur in these countries. Despite higher levels of both domestic violence and childhood mortality in developing countries, information about the association between domestic violence and child mortality in these countries is limited.18,19
The pathways through which domestic violence may lead to elevated risks for perinatal and childhood mortality are not fully understood. One possible pathway is the direct effect of blunt physical trauma and the resultant fetal death or subsequent adverse pregnancy outcome.6,20 A second potential pathway is elevated maternal stress levels and poor nutrition, both of which are associated with low birthweight or preterm delivery and are well-known risk factors for perinatal and infant mortality.2123 A third possible pathway is the deterrent effect of violence on womens use of preventive or curative health services during pregnancy, delivery, and after the birth.2426
Data from Uttar Pradesh, North Indiawhere there are high levels of both domestic violence within marriage18,27 and early childhood mortality levels28,29provided a unique opportunity for investigating this association. Our objectives were to (1) examine the bivariate association between domestic violence and mortality risks during early childhood, (2) investigate the association between domestic violence and maternal health care behaviors, and (3) explore the association between domestic violence and perinatal, neonatal, postneonatal, and early-childhood mortality risks, after we controlled for the effects of maternal health care behaviors and other sociodemographic characteristics.
| METHODS |
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The PERFORM survey used a stratified multistage cluster sample design of households that yielded an overall sample of 45 277 reproductive-aged women in 28 districts of Uttar Pradesh. The Male Reproductive Health Survey was conducted approximately 6 months later. The sampling frame for this latter survey comprised all husbands in households identified during the first-stage sample in 5 of the original 28 sampled districts. Eligibility criteria for men included being currently married, residing with their wife, and being between 15 and 59 years of age, which resulted in a final sample of 6606 husbands. Details about both surveys have been published elsewhere.30 We used relationship-to-head-of-household codes to successfully match the records of 5553 husbands (84.1%) with survey data for their wives. A separate analysis indicated that the matched and unmatched cases were very similar in terms of sociodemographic characteristics (data not shown). The sample for our study comprised the 2199 pregnancy outcomes that occurred during the 3-year period before the womens survey. Among women who had multiple pregnancies during this period, only the most recent pregnancy outcome was considered.
The questionnaire for the male survey was administered by trained male interviewers, either within a private area of the home or outside the home. The survey covered a wide range of issues about household socioeconomic and demographic status, contraceptive knowledge and behavior, health expenditures, and reproductive health. The survey also included a series of detailed questions about the husbands perpetration of physical violence against his wife, which was the focus of our study. Husbands were asked whether they had ever physically hit, slapped, or kicked their wives; the initial and most recent timings of such physical violence; and the total number of episodes that had occurred. No direct question asked whether the husbands had been physically violent with their wives during the most recent pregnancy. We used data from the wives sample on the date of the most recent pregnancy outcome and juxtaposed the pregnancy interval with the date of first and most recent period of reported physical violence. We classified women as having experienced domestic violence if their husband reported that the timing of domestic violence commenced either before or during this pregnancy and continued for part or all of the pregnancy.
Our mortality outcome measures were derived from data collected in the womens survey. A detailed pregnancy history for the 3 years immediately preceding the interview was included in this survey, which collected information on all pregnancies, pregnancy outcomes, and subsequent deaths. The outcome status of each known pregnancy was recorded as an early fetal loss, stillbirth, or live birth. Those women who initially reported a stillbirth were further queried about whether the child had shown any movement or breathing immediately after birth to reduce misclassification of live births as stillbirths. Age at death was recorded in days for children who died during the first month of life, in months for deaths during the first year, and in years for deaths after the first year.
This information was used to calculate perinatal (stillbirths and deaths during the first 7 days of life), neonatal (deaths within the first month of life), postneonatal (deaths after first month but before completion of the first year of life), infant (deaths before completion of the first year oflife, 1q 0) and early-childhood (deaths between the first and third year of life, 3 q 1) mortality rates. Also included in the pregnancy history were detailed questions about prenatal care, delivery care, and postpartum care from trained health personnel and the womans acceptance of tetanus toxoid immunization for each reported pregnancy outcome. Each of these 4 variables was used as an outcome for the health careseeking behavior analysis (to examine the question of whether domestic violence deters maternal health care use) and as an independent variable for child mortalityrelated outcome analysis (to examine the question of whether domestic violence is a risk factor for early-childhood mortality after we controlled for maternal health care behaviors and other covariates).
All violence-related variables were obtained from data collected in the male survey. The multivariate models were adjusted for the effects of mothers age, parity, mothers and fathers education, socioeconomic status, caste, whether the pregnancy/child was wanted, and the set of variables that reflected maternal health care behaviors (prenatal care, maternal tetanus toxoid immunization, institutional delivery for perinatal and neonatal mortality, and postpartum care for only the postneonatal and early-childhood mortality models).
We initially examined differentials in child survival probabilities by maternal exposure to domestic violence with the KaplanMeier life table method. The similarities in survival curves were compared with both the Wilcoxon signed rank and log-rank tests. In the log-rank test, deaths were equally weighted, and in the Wilcoxon test, early deaths were weighted more heavily than later deaths. Because deaths during childhood were more concentrated during the earlier period, we are presenting the Wilcoxon
2 results. All childhood mortality rates were estimated as death probabilities between age x and n from the life table where
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where qi is the mortality risk at age i, and
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equals survival probability at age n.
We used logistic regression models to examine the effects of domestic violence on selected maternal health care behaviors. To explore the effects of domestic violence on early-childhood mortality, we used time-to-event analysis with Cox proportional hazards models. Because the surveys were constructed on the basis of a stratified multistage cluster sampling design, we estimated consistent standard errors to take into account higher intraclass correlation at cluster level observations and to avoid spurious rejection of null hypotheses because of underestimated naïve standard errors. For the Cox proportional hazards models of mortality outcomes, we used the Wei and Lin method, which is a marginal-model specification.31 For the logistic regression models of maternal health care behaviors, we used Taylors linearization method for variance estimation.32 We used Stata 8 software (Stata Corp, College Station, Tex) for all analyses.
Additionally, we estimated the population attributable fraction (PAF) to assess the hypothetically expected reduction in incidence of early-childhood mortality that would be achieved if mothers had been entirely unexposed to domestic violence compared with the current level of exposure.33 In terms of incidence, PAF is expressed as (Ip-Ir )/Ip , where Ip is actual population incidence and Ir is the expected incidence when the exposure is eliminated. Equivalently, PAF = (R1)/R, where R is the incidence risk ratio (Ip /Ir ).
| RESULTS |
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Figure 1
shows the KaplanMeier survival curves for infants aged 0 to 11 months by mothers domestic violence experience. Overall, the survival probabilities for infants were significantly lower among women who experienced domestic violence (Wilcoxon
2 = 4.72; P = .030). Table 1
shows specific infant and early-childhood mortality rates by exposure to violence. The most pronounced differentials in mortality rates were during the earliest period of life. Both perinatal and neonatal mortality rates were almost twice as high among women who experienced domestic violence than among women who did not experience domestic violence (perinatal mortality: 49.4 vs 24.3 per 1000 births, P = .007; neonatal mortality: 49.5 vs 26.1 per 1000 live births, P = .014). The association between domestic violence and childhood mortality risks weakens as children age, with both postneonatal and early-childhood mortality rates no longer significantly associated with mothers exposure to violence. Overall, the risk for infant mortality was 36% higher among mothers who experienced domestic violence compared with mothers who did not experience violence (77.1 vs 56.9 per 1000 live births, P = .063).
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We also estimated the PAF to evaluate the effect of eliminating domestic violence on potential reductions in perinatal and neonatal mortality. The PAF was 18% (95% CI = 3%, 30%) for perinatal mortality and 17% (95% CI = 3%, 29%) for neonatal mortality. The overall PAF for perinatal and neonatal mortality was 18% (95% CI = 6%, 29%), which indicates that approximately 1 in 5 stillbirths and deaths during the first month of life could potentially have been prevented if domestic violence was eliminated.
| DISCUSSION |
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It is interesting to compare our findings with previous developing-country studies of domestic violence and childhood mortality. In the study most relevant to ours, an Indian study reported roughly a 2-fold higher risk for both fetal and infant death among pregnant women who reported lifetime domestic violence, with effects somewhat stronger in the North Indian state of Uttar Pradesh than in the South Indian state of Tamil Nadu.18 Similarly, a case-referent study conducted in Nicaragua found roughly 8-fold and 6-fold higher risks for infant (011 months) and early-childhood (059 months) mortality, respectively, among births whose mothers experienced lifetime physical and sexual intimate-partner violence.19 A separate study of prenatal clinic patients in a Chinese community, however, reported no association between domestic violence by male partners (defined in that study as primarily psychological in the form of threats of abuse without physical injury) and pregnancy outcomes.
The fact that our measure of domestic violence was determined on the basis of husbands responses is both a potential strength of and a limitation to our study. Its strength is derived from the fact that our measure of violence was reported by a separate and independent source (husbands) than that for the primary outcome of interest in our studychildhood mortality (women). A potential limitation is that obtaining data on the occurrence of male-to-female violence from the perpetrators of such violence raises concerns about possible underreporting of this behavior. Previous studies from other settings, however, indicate comparable aggregate levels in mens and womens reports of recent domestic violence.3537 Moreover, the prevalence levels of violence obtained from our survey of husbands were comparable with those reported in previous community-based and hospital-based studies of women in North India,18,29,38,39 which suggests that to the extent it is present, underreporting of violence may not be appreciable.
An additional limitation to our study is the measurement of domestic violence. Because there was no direct question about whether physical violence took place during the pregnancy of interest, we had to match data on the reported timing of the initiation and cessation of violence toward wives with data on the timing of the most recent pregnancy. Additionally, in a retrospective study such as ours, the issue of recallabout both the occurrence and the specific timing of onset and termination of violenceraises the possibility of misclassification of our primary exposure variableviolence during pregnancyif such violence actually took place when the woman was not pregnant.
A final possible limitation to our study is that our mortality outcome variables were derived from retrospective reports by mothers, and both pregnancies and deaths may have been underreported. Although we cannot rule out this possibility, infant mortality levels across the 5 study districts were broadly similar to the levels that were reported in a separate district-level analysis.40 Moreover, the fact that our exposure variableviolence during pregnancywas obtained from a source (husbands) separate from our outcome variable of childhood mortality (wives) makes any systematic bias associated with underreporting unlikely.
Although additional research is clearly needed, our findings have potentially significant implications for current public health programs in developing countries. Efforts to reduce levels of domestic violencethrough channels such as public education, legal reform, and community actionare in very early stages in almost all developing countries. Womens freedom from such violence is a fundamental human and reproductive right. Our findings contribute additional impetus to the importance of domestic violence prevention by providing some of the most conclusive evidence to date about the adverse consequences of violence during pregnancy for subsequent child survival. It is noteworthy that, to date, the issue of domestic violence has remained largely outside the purview of child survival programs. Although significant progress has been made during the past 2 decades in reducing levels of childhood mortality in developing countries, the levels of perinatal and neonatal mortality remain high in low-resource areas such as North India.41 Addressing the issue of domestic violence within such programs will further reduce preventable early mortality in these areas. Our finding that almost 1 in 5 perinatal and neonatal deaths could have been prevented with the elimination of domestic violence compares favorably with the impact of other child survival interventions.42 Our results underscore the need for public education and awareness programs that highlight the serious and negative consequences of domestic violence for the health and well-being of both mothers and their children.
| Acknowledgments |
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Human Participant Protection
This study was reviewed and approved by the institutional review board of the Johns Hopkins University Bloomberg School of Public Health.
| Footnotes |
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Contributors
S. Ahmed and M. A. Koenig analyzed the data, interpreted the results, and wrote the text. R. Stephenson reviewed the article and contributed significantly to the completion of this study.
Accepted for publication October 9, 2005.
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