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RESEARCH AND PRACTICE |
Jeani Chang, Cynthia J. Berg, and Joy Herndon are with the Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Ga. Linda E. Saltzman is with the Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention.
Correspondence: Requests for reprints should be sent to Jeani Chang, MPH, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, 4770 Buford Highway, NE, Mail Stop K-21, Atlanta, GA 303413724 (e-mail: jchang{at}cdc.gov).
| ABSTRACT |
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Objectives. We identified risk factors for pregnancy-associated homicide (women who died as a result of homicide during or within 1 year of pregnancy) in the United States from 1991 to 1999.
Methods. Pregnancy-associated homicides were analyzed with data from the Pregnancy Mortality Surveillance System at the Centers for Disease Control and Prevention.
Results. Six hundred seventeen (8.4%) homicide deaths were reported to the Pregnancy Mortality Surveillance System. The pregnancy-associated homicide ratio was 1.7 per 100000 live births. Risk factors included age younger than 20 years, Black race, and late or no prenatal care. Firearms were the leading mechanism for homicide (56.6%).
Conclusions. Homicide is a leading cause of pregnancy-associated injury deaths.
| INTRODUCTION |
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Several state- and city-based studies have recently reported that homicide is a leading cause of death during pregnancy and in the postpartum period.39 One inner-city hospital study indicated that homicide has become the leading cause of death during or within 90 days of the end of pregnancy.10 However, studies have not been conducted at the national or regional level that focus on the identification of risk factors for and groups at high risk of homicide during pregnancy or in the postpartum period. Our report describes homicide deaths occurring during or within 1 year of pregnancy in the United States from 1991 through 1999. We used a national, population-based data set to identify characteristics and risk factors associated with these deaths.
| METHODS |
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Each year, health departments in the 50 states, the District of Columbia, and New York City voluntarily provide the CDC with de-identified copies of death certificates and, for those deaths following a live birth or stillbirth, matching birth or fetal death certificates. Furthermore, state maternal mortality review committees, the media, and individuals report a few cases not otherwise identified. Each death is reviewed and confirmed by medical epidemiologists at the CDC as to cause of death, associated conditions, and the outcome of the pregnancy (i.e., live birth, stillbirth, ectopic pregnancy, abortion [induced and spontaneous], or gestational trophoblastic neoplasia). Because International Classification of Diseases codes12,13 are rarely available on the death certificates the CDC receives, the PMSS uses all available information from the death, birth, and fetal death certificates and any accompanying materials such as autopsy or maternal mortality review committee reports to assign a cause of death. The PMSS coding system, which includes codes for intentional (homicide and suicide) and unintentional injury (motor vehicle accidents, falls, burns, and other injuries caused by natural or environmental factors), is used. The PMSS uses limited variables that were available from our data sources to examine potential risk factors associated with pregnancy-associated deaths from homicide.
Pregnancy-associated homicide ratios were defined as the number of pregnancy-associated homicide deaths obtained from the PMSS (numerator) per 100 000 live births (denominator) obtained from the national natality files compiled by the CDCs National Center for Health Statistics.14 The ratios were calculated using data from 1991 through 1999 for both the numerator and the denominator. Also, for both the numerator and the denominator of pregnancy-associated homicide ratios, race was defined as the race of the mother and classified as White, Black, or other. Other races included Asian/Pacific Islander, American Indian/Alaska Native, and those reported as "other." The womens ages at the time of death were grouped into standard 5-year intervals. Education information was obtained from the death, birth, or fetal death certificates and was based on total years of education completed at the time of death. Because many women younger than 20 years would not be expected to have completed high school, the analysis of education was restricted to women aged 20 years or older. In addition, the state of Georgia did not report maternal education during 3 years of the surveillance period (19971999); therefore, women younger than 20 years and women who died in Georgia were excluded from analyses by education. Marital status was categorized as married (currently married) or unmarried (never married, divorced, separated, or widowed).
When available, time of death was defined as the number of days between the date of delivery/pregnancy termination (e.g., live birth, stillbirth, and abortion) and the date of homicide and categorized as follows: 03 months, > 36 months, > 69 months, and > 912 months. Information on prenatal care and live birth order were limited to homicide deaths that occurred after delivery of live-born or stillborn infants, because these data were not otherwise available (e.g., for ectopic pregnancies and other undelivered events). Onset of prenatal care was categorized as initiation in the first, second, or third trimester, or no prenatal care. Live birth order, defined as the number of live births, including the index pregnancy that the woman had delivered, was examined, because it is included on the national natality files.14 In addition, if available, information on the mechanisms used for homicide was obtained from the death certificates.
| RESULTS |
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Of all pregnancy-associated injury deaths (n = 1993), 617 (31.0%) women died as a result of homicide, ranking homicide as the second leading cause of total reported injury deaths among pregnant women and postpartum women, following deaths caused by motor vehicle accidents (44.1%). The rest of the pregnancy-associated injury deaths were attributed to unintentional injuries (12.7%), suicide (10.3%), and other (2.0%). Analyses in this report are based on these 617 pregnancy-associated homicide cases, which represent 8.4% of the total 7342 reported deaths. A matched birth certificate was available for 98% (n = 305) of these pregnancy-associated homicide deaths that occurred after a live birth (n = 311), and a matched fetal death certificate was available for 93% (n = 13) of the deaths that occurred after a stillbirth (n = 14).
During 1991 through 1999, the overall pregnancy-associated homicide ratio was 1.7 deaths per 100 000 live births (ranging from 0.82.2 deaths per 100 000 across the different years). Race was strongly associated with pregnancy-associated homicide deaths (Figure 1
). The pregnancy-associated homicide ratio was consistently higher in Black women than in White women over the 9-year surveillance period. The overall ratio for Black women (6.4) was about 7 times higher than that for White women (0.9). Table 1
presents pregnancy-associated homicide ratios for Black and White women by various characteristics at the time of death. Women aged younger than 20 years of all races combined had the highest pregnancy-associated homicide ratio, and the ratio decreased as the womans age increased. Although the risk among Black women aged younger than 20 years (9.4) was nearly 5 times greater than that for White women aged younger than 20 years (2.0), the racial disparity was the greatest among women aged 25 to 29 years; Black women in this age group were about 11 times as likely to die as a result of homicide as White women (5.5 vs 0.5). Additionally, the racial difference was more pronounced among married women. The pregnancy-associated homicide ratio for Black married women was 7 times the risk for White married women (3.5 vs 0.5). For White and Black women who had never been married or were not married at the time of their death, the mortality ratios were 4 (2.0 vs 0.5) and 2 (7.6 vs 3.5) times higher, respectively, than for women who were married.
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The distribution of the outcome of pregnancy-associated homicides is shown in Table 2
. Overall, more than half (52.7%) of the pregnancy-associated homicides occurred during the postpartum period among women who had delivered a live-born (50.4%) or a stillborn infant (2.3%), 20.6% of the deaths occurred while the women were still pregnant (undelivered), and 0.8% occurred among women who had an abortion (Table 2
). The time of death was not known for 160 (25.9%) of the women. The distribution of time of death among postpartum women by race was similar for both Black and White women, where pregnancy-associated homicide most frequently occurred during the first 3 months after delivery of a live-born or stillborn infant. However, homicide deaths occurred more frequently among White women (24.8%) during pregnancy than among Black women (17.7%) during pregnancy. Of the 5 women who died as a result of homicide after an abortion, 4 deaths occurred during the first 6 months after the abortion. Information on the gestational age at pregnancy termination was not available.
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| DISCUSSION |
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Of pregnancy-associated homicide deaths that occurred after a live birth or a stillbirth, 43.4% of Black women and 61.7% of White women had initiated prenatal care during the first trimester as recommended. Nevertheless, pregnancy-associated homicide ratios for Black women were higher at each level of prenatal care initiation than they were for White women. In addition, we found that pregnancy-associated homicide ratios were 2 to 5 times higher among women who received no prenatal care compared with those who received any prenatal care during pregnancy, particularly compared with women who started prenatal care in the first trimester.
Literature on violence around the time of pregnancy indicates that 4% to 8% of women are abused during pregnancy, with a majority of perpetrators being intimate partners.17,18 McFarlane et al. found a 3-fold increased risk of homicide (attempted or completed) among women abused during pregnancy than among women who were abused but not during pregnancy.16,19 It is reasonable to assume that some percentage of the pregnancy-associated homicides we examined are also the result of intimate partner violence, but unfortunately we do not have data in our study to examine the abuse status or victimperpetrator relationship involved for the pregnancy-associated homicides. Although the effectiveness or safety of screening for partner violence has not yet been determined in clinical trials,20 it has often been recommended that comprehensive prenatal care include screening for intimate partner violence16,21 and that care providers consider discussing intimate partner violence, particularly with women who present late in pregnancy.22,23 The fact that women who receive no prenatal care have the highest risk of pregnancy-associated homicide makes this an even greater challenge for clinical and public health communities, as alternative ways to reach these women need to be found. For over a decade, the American College of Obstetricians and Gynecologists has advocated that medical school curricula address the need to identify abused women and provide standard care accordingly.24,25 Because an unknown proportion of pregnancy-associated homicides are committed by perpetrators other than intimate partners, it may be worthwhile to consider talking to women in prenatal care about their overall risk of violent assault, not just risk from intimate partners. Because most pregnant women receive prenatal care or visit their health care provider repeatedly during their pregnancy, prenatal and postpartum clinical visits represent an opportunity for discussion about violence and for referral and possible intervention.11,26,27
When interpreting this reports finding that homicide is the second leading cause of injury-related death among pregnant and postpartum women, it is important to note that our findings regarding homicides involving pregnant and postpartum women are similar to national statistics1 on homicide among all women of reproductive age (regardless of whether they are pregnant or not). In the United States, homicide is a leading cause of death among Black and young women (aged 1524 years), regardless of pregnancy status, and the majority of homicides among all women of reproductive age are carried out with firearms.2 Despite these similarities regarding risk groups, there are some differences for the risk of homicide among pregnant and postpartum women versus women who have not had recent pregnancies. Krulewitch and colleagues found that in an urban population in which over 80% of pregnancy-associated deaths occurred in minority women, homicides occurred more frequently among pregnant and postpartum women compared with nonpregnant women (43% vs 32%). In addition, those pregnant and postpartum homicide victims were much younger than their nonpregnant counterparts.21 After adjusting for race and age, the study by Horon and Cheng from Maryland indicated that homicide is still responsible for a greater proportion of deaths among pregnant and postpartum women (20.2%) than among women who have not been pregnant in the year preceding death (11.2%) (risk ratio=1.8 vs 3.2 before adjustment of race and age).7 In another analysis, Dietz et al. assessed whether postpartum women were at equal risk for injury death as other women of reproductive age in a state population and found that postpartum women aged 15 to 19 years were at higher risk of being victims of homicide (2.6 times) compared with nonpregnant, nonpostpartum women in the same age group.9 The relationship between homicide and pregnancy is a complex one, with several factors such as race and age modifying the effect.
Several limitations of the PMSS data should be recognized in the interpretation of this study. Although the PMSS is the most comprehensive pregnancy-associated mortality database available at the national level, reliance on death certificate and birth certificate data is not optimal in 2 areas. The first critical limitation is the fact that not all reporting areas link fetal death or birth certificates with maternal death certificates, and linkage has been shown to increase the ascertainment of maternal deaths by 30% to 150%.28 Although the CDC requests certificates on deaths during or within a year of pregnancy, including those caused by injuries, information about pregnancy status for women suffering injury deaths can be hard to identify unless a linkage is performed by the reporting area. In addition, the fact that the CDC does not receive cases that the reporting areas might identify through review of autopsy records means most early-gestation pregnancies are missed.7 Thus, our numbers of pregnancy-associated injury deaths, including those caused by homicide, are underestimated.29 However, we have no reason to suspect that the risk factors for pregnancy-associated homicide deaths that we found are not accurate.
Given that linking death certificates of women of reproductive age to live birth or fetal death records substantially increases ascertainment of postpartum pregnancy-associated deaths (e.g., deaths associated with live birth or stillbirth outcomes), our findings that more than half of the pregnancy-associated homicides occurred among postpartum women (compared with just one fifth of the women whose deaths occurred during pregnancy) might reflect enhanced ascertainmentand might not be the result of pregnancy being protective, although that might also be the case. More study of those issues is clearly needed. On a similar note, because the inclusive time interval (e.g., the interval between the end of pregnancy and maternal death) used in the pregnancy check box on the death certificate varies by reporting areas, mostly within 90 days or 3 months postpartum,30 it is not surprising that analysis in this report revealed that pregnancy-associated homicide occurred most frequently during the first 3 months after delivery of a live-born or stillborn infant.
Another limitation to the PMSS is the quality and completeness of data. Death certificate data are acknowledged to be of variable quality. However, Moyer et al. compared the underlying cause of death (injury-related) as determined from death certificates with those determined by an independent review committee and found a high level of agreement for broad and specific categories of suicide and homicide (
90% sensitivity and specificity).31 Death certificates and matched birth certificates were our main source of data. We were limited to variables included in those records and by the fact that they have virtually no information from medical, hospital, or autopsy records or from police investigations. Although the percentage of data missing for each of the variables differed, we have no reason to believe that the missing data are distributed other than randomly. According to the Federal Bureau of Investigation, in 2002, approximately one third (32.1%) of female homicide victims in this country died at the hands of a husband, ex-husband, or boyfriend.32 In cases of homicide deaths, the PMSS has no information on the relation between the perpetrator and the victim or the history of abuse of the victims, which may be some of the most important risk factors for pregnancy-associated homicide. Furthermore, we do not have data regarding whether the victims pregnancy status was specifically related to her homicide or whether any of the pregnancy-associated homicides were preventable. The issue of whether pregnant or postpartum women are at increased or decreased risk of homicide compared with non-pregnant women is important but difficult to assess, because there is no standard method with which to identify pregnancy status among women of reproductive age. These are topics for further research.
Because this study is based on data provided voluntarily by state health departments in the 50 states, the District of Columbia, and New York City, methods used to identify pregnancy-associated homicide deaths differed by reporting area. To identify groups as high risk of homicide during pregnancy or within 1 year of pregnancy as well as those individuals prone to commit those homicides, all reporting areas should be encouraged to improve their data on pregnancy-associated homicide deaths. This would require them to use record linkages (e.g., link death certificates with birth and fetal death certificates, with autopsy records, and with police reports) to identify all pregnancy-associated deaths and to obtain more complete information about pregnancy-associated deaths caused by homicide (e.g., victimperpetrator relationship and the perpetrators knowledge of the pregnancy) or other types of injury as part of their routine maternal mortality surveillance process.33
A new surveillance system, the National Violent Death Reporting System, is currently being developed by the CDC to collect timely information on violent deaths including those from suicide, homicide, undetermined intent, legal intervention, and unintentional firearm injury. The National Violent Death Reporting System includes linked state information from death certificates, medical examiner/coroner files, law enforcement records, and crime laboratories.34 Although the system has only recently been started, it is designed to enhance our understanding of the scope and nature of violent deaths. Because it can capture information about pregnancy status, victimperpetrator relationships, and presence of intimate partner violence, it has the potential to strengthen ascertainment and classification of pregnancy-associated homicides.
| Acknowledgments |
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| Footnotes |
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Contributors
J. Chang originated the study, completed the analyses, and led the writing of the article; C.J Berg, L.E. Saltzman, and J. Herndon assisted with the study and the writing of the article. All authors helped to conceptualize ideas, interpret findings, and review drafts of the article.
Human Participant Protection
No protocol approval was necessary for this study.
Accepted for publication April 23, 2004.
| References |
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2. Moracco KE, Runyan CW. Femicide in North Carolina, 19911993. Homicide Stud. 1998;2:422447.
3. Parsons LH, Harper MA. Violent maternal deaths in North Carolina. Obstet Gynecol. 1999;94:990993.
4. Fildes J, Reed L, Jones N, Martin M, Barrett J. Trauma: the leading cause of maternal death. J Trauma. 1992;32:643645.[ISI][Medline]
5. Dannenberg AL, Carter DM, Lawson HW, Ashton DM, Dorfman SF, Graham EH. Homicide and other injuries as causes of maternal death in New York City, 1987 through 1991. Am J Obstet Gynecol. 1995;172: 15571564.[CrossRef][ISI][Medline]
6. Sachs BP, Brown DAJ, Driscoll SG, et al. Maternal mortality in Massachusetts. N Engl J Med. 1987;316: 667672.[Abstract]
7. Horon IL, Cheng D. Enhanced surveillance for pregnancy-associated mortality: Maryland, 19931998. JAMA. 2001;285:14551459.
8. Jocums SB, Berg, CJ, Entman SS, Mitchell, EF. Postdelivery mortality in Tennessee, 19891991. Obstet Gynecol. 1998;91:766770.[Abstract]
9. Dietz PM, Rochat R, Thompson BL, Berg CJ, Griffin GW. Differences in the risk of homicide and other fatal injuries between postpartum women and other women of childbearing age: implications for prevention. Am J Public Health. 1998;88:641643.
10. Ho EM, Brown J, Graves W, Lindsay M. Maternal death at an inner-city hospital, 19492000. Am J Obstet Gynecol. 2002;187:12131216.[CrossRef][ISI][Medline]
11. Ellerbrock TV, Atrash HK, Hogue CJR, Smith JC. Pregnancy mortality surveillance: a new initiative. Contemp Obstet Gynecol. 1988;6:2334.
12. Manual of the International Statistical Classification of Diseases, Injuries, and Causes of Death (ICD-9), Vol 1. Geneva, Switzerland: World Health Organization; 1977.
13. International Statistical Classification of Diseases and Related Health Problems (ICD-10), Vol 1. Geneva, Switzerland: World Health Organization; 1992.
14. Natality Data, Public Use Data Files, Detail Files (19911999). Hyattsville, MD: US Department of Health and Human Services, Public Health Service, CDC, National Center for Health Statistics, 19911999. Available at: http://wonder.cdc.gov/wonder/sci_data/natal/detail/detail.asp. Accessed April 9, 2003.
15. Chang J, Elam-Evans LD, Berg CJ, et al. Pregnancy-related mortality surveillance: United States, 19911999. MMWR Surveill Summ. 2003;52:18.[Medline]
16. McFarlane J, Campbell JC, Sharps P, Watson K. Abuse during pregnancy and femicide: urgent implications for womens health. Obstet Gynecol. 2002;100: 2736.
17. Saltzman LE, Johnson CH, Colley Gilbert B, Goodwin MM. Physical abuse around the time of pregnancy: an examination of prevalence and risk factors in 16 states. Matern Child Health J. 2003;7:3143.[CrossRef][Medline]
18. Gazmararian JA, Lazorick S, Spitz AM, Ballard TJ, Saltzman LE, Marks JS. Prevalence of violence against pregnant women. JAMA. 1996;275:19151919.[Abstract]
19. McFarlane J, Parker B, Soeken K. Abuse during pregnancy: frequency, severity, perpetrator, and risk factors of homicide. Public Health Nurs. 1995;12: 284289.[ISI][Medline]
20. Ramsay J, Richardson J, Carter Y, Davidson L, Feder G. Should health professionals screen women for domestic violence? Systematic review. BMJ. 2002;325: 314326.
21. Krulewitch CJ, Pierre-Louis ML, de Leon-Gomez R, Guy R, Green R. Hidden from view: violent deaths among pregnant women in the District of Columbia, 19881996. J Midwifery Womens Health. 2001;46: 410.
22. Parker B, McFarlane J, Soeken K. Abuse during pregnancy: effects on maternal complications and birth weight in adult and teenage women. Obstet Gynecol. 1994;84:323334.
23. Dietz PM, Gazmararian JA, Goodwin MM, Bruce C, Johnson CH, Rochat RW. Delayed entry into prenatal care: effect of physical violence. Obstet Gynecol. 1997;90:221224.[Abstract]
24. The Battered Woman. Washington, DC: American College of Obstetricians and Gynecologists; 1989. ACOG technical bulletin 124.
25. Domestic Violence. Washington, DC: American College of Obstetricians and Gynecologists; 1999. ACOG technical bulletin 257.
26. Durant T, Colley Gilbert B, Saltzman LE, Johnson CH. Opportunities for intervention: discussing physical abuse during prenatal care visits. Am J Prev Med. 2000;19:238244.[CrossRef][ISI][Medline]
27. Rodriguez MA, Bauer HM, McLoughlin E, Grumbach K. Screening and intervention for intimate partner abuse: practices and attitudes of primary care physicians. JAMA. 1999;282:468474.
28. Atrash HK, Alexander S, Berg CJ. Maternal mortality in developed countries: not just a concern of the past. Obstet Gynecol. 1995;86:700705.[Abstract]
29. Heilemichael RG, Elam-Evans LD, Chang J, et al. National pregnancy mortality surveillance: a pilot project for enhancement. Presented at the Eighth Annual Maternal and Child Health Epidemiology (MCH EPI) Conference (212-Session E24), December 1113, 2002, Clearwater, Fla.
30. MacKay AP, Rochat R, Smith JC, Berg CJ. The check box determining pregnancy status to improve maternal mortality surveillance. Am J Prev Med. 2000; 19(1 suppl):3539.[CrossRef][ISI][Medline]
31. Moyer LA, Boyle CA, Pollock DA. Validity of death certificates for injury-related causes of death. Am J Epidemiol. 1989;130:10241032.
32. Crime in the United States 2002: Uniform Crime Reports. Washington, DC: US Department of Justice; 2003.
33. Strategies to Reduce Pregnancy-Related Deaths from Identification and Review to Action. Atlanta, Ga: Centers for Disease Control and Prevention, Division of Reproductive Health, Safe Motherhood Activity; 2001.
34. Paulozzi LJ, Mercy J, Frazier L, Annest JL. CDCs National Violent Death Reporting System: background and methodology. Inj Prev. 2004;10:4752.
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