Fémicide-suicide intime en Afrique du Sud : étude transversale
Feminicidio-suicidio de parejas en Sudáfrica: estudio transversal
Shanaaz MathewsI,1; Naeemah AbrahamsI; Rachel JewkesI; Lorna J MartinII; Carl LombardIII; Lisa VettenIV
IGender and Health Unit, Medical Research Council, PO Box 19070,Tygerberg 7505, South Africa
IIDivision of Forensic Medicine and Toxicology, University of Cape Town, Cape Town, South Africa
IIIBiostatistics Unit, Medical Research Council, Tygerberg, South Africa
IVCentre for the Study of Violence and Reconciliation, Braamfontein, Johannesburg, South Africa
OBJECTIVE: To examine the incidence and patterns of intimate femicidesuicide in South Africa and to describe the factors associated with an increase in the risk of suicide after intimate femicide (i.e. the killing of an intimate female partner).
METHODS: A cross-sectional retrospective national mortuary-based study was conducted at a proportionate random sample of 25 legal laboratories to identify all homicides committed in 1999 of women aged over 13 years. Data were collected from the mortuary file, autopsy report and a police interview.
FINDINGS: Among 1349 perpetrators of intimate femicide,19.4% committed suicide within a week of the murder. Suicide after intimate femicide was more likely if the perpetrator was from a white rather than an African racial background (odds ratio, OR: 5.8; 95% confidence interval, CI: 1.2127.84); was employed as a professional or white-collar worker rather than a blue-collar worker (OR: 37.28; 95% CI: 5.82238.93); and owned a legal gun rather than not owning a legal gun (OR: 45.26; 95% CI: 8.33245.8). The attributable fraction shows that 91.5% of the deaths of legal gun-owning perpetrators and their victims may have been averted if this group of perpetrators did not own a legal gun.
CONCLUSION: South Africa has a rate of intimate femicidesuicide that exceeds reported rates for other countries. This study highlights the public health impact of legal gun ownership in cases of intimate femicidesuicide.
OBJECTIF: Examiner l'incidence et les schémas du fémicide-suicide intime en Afrique du Sud et décrire les facteurs associés à une augmentation du risque de suicide après un fémicide intime (c'est-à-dire le meurtre d'un partenaire féminin intime).
MÉTHODES: Une étude rétrospective transversale nationale à partir d'autopsies a été menée dans un échantillon aléatoire proportionné de 25 laboratoires de médecine légale pour identifier tous les homicides commis en 1999 sur des femmes de plus de 13 ans. Les données ont été recueillies à partir des dossiers mortuaires, des rapports d'autopsie et des interrogatoires de police.
RÉSULTATS: Parmi 1349 auteurs de fémicide intime, 19,4 % s'étaient suicidés dans la semaine suivant le meurtre. Après un fémicide intime, la probabilité de suicide était plus grande si l'auteur était de race blanche plutôt que d'origine africaine (odds ratio, OR : 5,8 ; intervalle de confiance, IC à 95 % : 1,21-27,84), exerçait une profession libérale ou était employé plutôt qu'ouvrier (OR : 37,28 ; IC à 95 % : 5,82 238,93) et détenait légalement une arme à feu (OR : 45,26 ; IC à 95 % : 8,33-245,8). D'après la fraction attribuable, 91,5 % des décès des détenteurs légaux d'arme à feux et de leurs victimes auraient pu être évités si les meurtriers n'avaient pas détenu une telle arme.
CONCLUSION: L'Afrique du Sud présente un taux de fémicide-suicide intime qui dépasse les taux rapportés pour les autres pays. Cette étude met en lumière l'impact en termes de santé publique de la détention légale d'armes à feu dans les cas de fémicide-suicide intime.
OBJETIVO: Examinar la incidencia y las modalidades del feminicidio-suicidio de parejas en Sudáfrica y describir los factores asociados al aumento del riesgo de suicidio tras el feminicidio de pareja (es decir, el asesinato de la mujer con la que se mantiene una relación íntima).
MÉTODOS: Se realizó un estudio retrospectivo transversal nacional basado en depósitos de cadáveres en una muestra aleatoria proporcional de 25 laboratorios forenses a fin de identificar todos los asesinatos de mujeres de más de 13 años cometidos en 1999. Los datos analizados proceden de los registros de las morgues,de los informes de autopsia y de entrevistas con la policía.
RESULTADOS: De los 1349 feminicidas de su pareja, el 19,4% se suicidaron durante la semana siguiente al asesinato. El suicidio posterior al feminicidio de pareja era más probable cuando el autor era de raza blanca, por oposición a las personas de origen africano (razón de posibilidades, OR: 5,8; intervalo de confianza (IC) del 95%: 1,2127,84); tenía un empleo como profesional u oficinista en lugar de como trabajador manual (OR: 37,28; IC95%: 5,82238,93); o estaba en posesión legal de un arma de fuego (OR: 45,26; IC95%: 8,33245,8, en comparación con las personas sin arma). La fracción atribuible muestra que un 91,5% de las muertes de los asesinos en posesión legal de un arma de fuego y de sus víctimas podría haberse evitado si hubiesen carecido de arma.
CONCLUSIÓN: Sudáfrica presenta una tasa de feminicidio-suicidio de parejas superior a las de otros países. Este estudio pone de relieve el impacto para la salud pública de la tenencia legal de armas de fuego en los casos de feminicidio-suicidio de parejas.
Intimate femicide, the killing of a woman by her intimate partner, is considered the most extreme form and consequence of intimate partner violence. Until recently, not much has been known about this phenomenon in South Africa. The first national study on female homicide estimated that the intimate-femicide rate in 1999 was 8.8 per 100 000 women aged 14 years and older.1 This rate is higher than other reported rates worldwide, with the only comparison being North Carolina in the United States of America (USA), which has reported a rate of 3.46 per 100 000 women aged 15 years and older.2
Internationally, between 18% and 40% of perpetrators of intimate femicide commit suicide afterwards.37 The past decade has seen an emergence of studies from developed countries such as Australia and the USA that have explored the type of perpetrator and the associated risk factors.3,4,6 However, there is an absence of information from developing settings. More commonly, this phenomenon has been examined in homicide-suicide research, where the murder victims are both men and women and perpetrators may be either an intimate partner or not.
The South African national study on the epidemiology of female homicide provided the opportunity to describe the epidemiology of intimate femicidesuicide for the first time. This has not been described previously in a developing setting since such settings have limitations with the availability of reliable death data, thus placing a constraint on the range of variables available.
The aim of this paper is to describe the incidence and patterns of intimate femicidesuicide and the factors associated with an increased risk of suicide after intimate femicide.
This was designed as a cross-sectional mortuary-based national retrospective study of female homicide victims aged over 13 years who presented at a medical legal laboratory (MLL) between 1 January 1999 and 31 December 1999. In South Africa, all unnatural deaths are required to undergo a postmortem at an MLL to determine cause of death. All MLLs operating in 1999 formed part of the sample and were stratified based on the number of postmortems performed per annum; small < 500 bodies, medium 5001499 bodies and large ³ 1499 bodies. The approximate ratio of allocation between the three strata was 8:5:12 (8 large mortuaries, 5 medium mortuaries and 12 small mortuaries), which was based on optimal allocation fitting a sample of 25 mortuaries.8 Data were collected 3 years after the murder, so as not to compromise the criminal investigation. Ethical approval for the study was granted by the ethics committee of the South African Medical Research Council.
Data were collected from three sources using a pretested data collection sheet, which was designed based on an assessment of various instruments and was finalized after the pilot study. The primary data source was the death register at the MLLs so as to identify cases of homicide. The second data source was the postmortem report, which was entered onto the data collection sheet by the forensic pathologist on the team. Interviews with the investigating officer or police record reviews were the third data source. Police data allowed us to confirm a homicide, victimperpetrator relationship and whether the perpetrator committed suicide.
The following definitions were used:
Intimate femicide: The killing of a woman by an intimate partner. This includes the woman's husband, boyfriend (dating or cohabiting), ex-husband (divorced or separated) or ex-boyfriend, same sex partner or a rejected would-be lover.
Intimate femicidesuicide: An intimate femicide followed by the suicide of the perpetrator within a week of the homicide.
Intimate femicidenon suicide: The killing of a female by her intimate partner without subsequent suicide of the perpetrator.
The perpetrator was defined as the person whom the investigating officer considered as the primary person responsible for the homicide. Cases were classified into intimate femicide and non-intimate femicide, and then intimate-femicide cases were sub-classified into intimate femicidesuicide and intimate femicidenon suicide.
Classification bias was minimized through the use of two data sources; data from the investigating officer and the outcome of the inquest court inquiry.
Data collected from MLL records included information on police case details and victim information such as age, race, date and time of death. The pathology reports provided data on injuries, manner of death and primary cause of death. Data collected from the police included demographic details of perpetrator, victim perpetrator relationship and relationship status, previous history of violence, events leading to the murder, the legal outcome of the case or the death of the perpetrator. Data on race were collected: inequalities imposed by apartheid have had a lasting public health impact and must be considered by health researchers. Race was used based on the apartheid classification system as it is still documented in all official records. Race of the victim was determined through mortuary records, while perpetrator race was determined via police records. Race is accurately documented at both these sources as it is based on the person's identification documentation.
Data were analysed using Stata version 8 (StataCorp LP, College Station, TX, USA). The analysis took into account the survey design, including the stratification and weighting of the sample. Incidence rates for intimate femicidesuicide were calculated for victims and perpetrators using population estimates from the 1996 South African Census Report,9 adjusted to reflect the year under investigation. Descriptive statistics were used to compare intimate femicidesuicide and intimate femicidenon suicide cases. Significant differences between the two groups were tested using the chi-square test. Unadjusted odds ratios and 95% confidence intervals (CI) were calculated to describe the association between intimate femicidesuicide and selected variables. A logistic regression model was built to investigate the factors associated with intimate femicidesuicide. A backward stepwise model-building process was followed. Candidate variables for the model included perpetrator's race, victim's age, perpetrator's age, perpetrator's occupation, legal gun ownership, relationship status, events leading to the homicide, primary cause of death and mechanism of death. The final model contained the independent variables that remained significant at £ 0.05 level. Finally, the attributable fraction for legal gun ownership and intimate femicidesuicide was calculated using the adjusted odds ratio for gun ownership.10
A total of 3793 (95% CI: 26934894) estimated cases (weighted) were identified via death registers (Fig. 1). Complete police data were collected on 86.7% (3296; 95% CI: 24404152) of cases, of which 18.6% (95% CI: 13.924.2) had an unknown perpetrator and were excluded from further analysis. Overall 11.4% (95% CI: 7.815.0) of the perpetrators died in the 3 year follow-up period, with this figure increasing to 22.2% (95% CI: 15.231.3) for intimate-femicide perpetrators, suicide being the leading cause of death (86.6%; 95% CI: 73.699.4) in this group.
This study found an estimated 261 (95% CI: 155368) intimate femicidesuicide cases (i.e. 19.4% of intimate-femicide cases; 95% CI: 11.926.8), giving an intimate femicidesuicide fatality rate of 1.7 per 100 000 (95% CI: 1.02.4) women aged 14 years and older and a perpetrator fatality rate of 2.0 per 100 000 (95% CI: 1.22.8) males 15 years and older for 1999.
Table 1 presents the demographic characteristics of victims. The median age of victims of intimate femicidesuicide cases was 26 years and median age of victims of intimate femicidenon suicide cases was 30 years. Victims of intimate femicidesuicide cases were usually younger than their perpetrators, who were significantly less likely to commit suicide as the victim's age increased.
Table 2 shows that perpetrators of intimate femicidesuicide were more likely to be of white or Indian than of African racial background and least likely to be of mixed race; more likely to be younger; more likely to be employed; and more likely to be working in the security industry (police, army or as a guard) than a blue-collar worker.They were also more likely to own a legal gun.
Significant differences were found between the two intimate-femicide groups in relation to the preceding events to the murder (P = 0.03). In the intimate femicidesuicide group, women were more likely to have ended the relationship.
No significant differences were found in the primary cause of death. However, mechanism of death shows that intimate femicidesuicide cases were significantly more likely to have been killed by a gun and less likely to have been killed by blunt force, compared to intimate femicidenon suicide cases.
Table 3 shows a logistic regression model for factors associated with femicidesuicide perpetrators. This was more likely if the perpetrator was a professional or white-collar worker (odds ratio, OR: 37.3; 95% CI: 5.82238.93) rather than a blue-collar worker; owned a legal gun (OR: 45.26; 95% CI: 8.33245.80) and was racially classified as white (OR: 5.8; 95% CI: 1.2127.85) rather than African. Calculating the attributable fraction reveals that 91.5% of the deaths of legal gun-owning perpetrators and their victims may have been averted if legal gun ownership had been restricted among this group.
In South Africa during 1999, 19.4% of perpetrators of intimate femicide committed suicide. This proportion appears to be at the lower end of the range reported internationally (1840%),310 with similar rates reported for Australia (21%)5 and North Carolina, USA (24%).6 Yet, the intimate femicidesuicide fatality rate for women (1.7 per 100 000) was higher than the only comparable rate in North Carolina, USA, which reported an increase from 0.67 to 1.06 per 100 000 over a 5-year period.6 This increase of almost two times is similar to the overall difference in intimate-femicide rates between South Africa (8.8 per 100 000)1 and North Carolina (3.46 per 100 000).2 These high rates of intimate femicide and femicidesuicide appear to be related to the excessive levels of interpersonal violence prevalent in South Africa, with homicide being the second leading cause of death.11 We do not completely understand why South Africa has a lower proportion of intimate femicidesuicide, but it could be linked to the racial distribution of male suicides. Our overall suicide rate is comparable to global rates, however, we have an overrepresentation of white males.12 This difference suggests that a different dynamic exists within South Africa and could partly be explained by the prevailing high level of interpersonal violence and gender inequality.
Intimate femicidesuicide has often been considered as a distinct phenomenon, differing from both female homicide and intimate femicide.13 However, few studies have been conducted to explore its associated factors. Risk factor studies from the USA have shown that a history of domestic violence is an important risk factor for both intimate femicide and femicidesuicide.4,6 An important limitation of this study is that history of domestic violence was not routinely investigated by the police. This information was only known for one-third of intimate-femicide cases, with no data on previous violence for femicidesuicide cases as they were investigated only as inquest enquiries.
Theories on the cause of intimate femicidesuicide have a common theme of jealousy and possessiveness by the women's male partner.5,13,14 Some authors have argued that it is due to depression in the perpetrator, which results in morbid jealousy and delusions that lead him to kill his partner.5,15,16 Intimate femicidesuicide is often premeditated and carefully planned.13,14,17 This is demonstrated by the short period of time between the two acts, as well as suicide notes and a history of stalking.13 Graser17 suggests that this is primarily an extended suicide (i.e. the primary aim is suicide), which is rational and carefully planned, with the homicide being an act of taking the family with him. Intimate femicide may also occur as a spontaneous act of murder occurring in a fit of jealousy, with the suicide being an act of remorse or stemming from fear of the consequences. The extent of premeditation, depression in the perpetrator or spontaneity of the act could not be determined in our study as the police had limited information in their files.
Suicide among intimate-femicide perpetrators was more likely if the perpetrator was white; employed as a professional or white-collar worker; and owned a legal gun. Given South Africa's political history, race is often a loose indicator of socioeconomic status and social group membership, or culture.18 The increased suicide risk for white men matches national suicide patterns in South Africa that show the rate of suicide overall is highest in this group.12 Therefore we suggest that the social meaning of intimate femicide, and the perpetrator's reaction afterwards, may differ between racial groups. Interestingly, overall intimate-femicide rates were found to be lowest among white males.1
Studies that have explored the factors associated with intimate femicidesuicide4,5,7 suggest that it is a "middle-class phenomenon", more common among married men who are employed. Kozoil-McLain et al.4 report that perpetrators of intimate femicidesuicide were more "conventional", employed, married, did not abuse drugs or abuse their partner during pregnancy. This study has also found that perpetrators of intimate femicidesuicide were of a higher socioeconomic status and would perhaps have more to lose after killing an intimate partner. This suggests that the possibility of negative consequences, such as the shame attached to incarceration and imprisonment, might result in the perpetrator choosing to commit suicide.
Legal gun ownership has been shown to be strongly associated with an increased risk of intimate femicidesuicide in other studies.3,4,7,14,15 This almost certainly is due to the lethality of guns and the ease with which they can be used in suicide. The greater proportion of perpetrators employed in the police, army or private security industry reflects the easier access to guns in these professions. Two-thirds of intimate femicidesuicide perpetrators owned a legal gun and the attributable fraction shows that a large proportion of these deaths might have been prevented should gun ownership within this group have been restricted. The strong association found between legal gun ownership and intimate femicidesuicide suggests that access to legal guns in South Africa requires urgent attention. In the USA, it was found that restricting gun access for abusers who had restraining orders decreased rates of intimate partner killings, while confiscation and domestic violence laws proved ineffective.19 This suggests that, although there has been huge emphasis on illegal gun ownership in South Africa, legal gun ownership and its relationship with intimate partner violence clearly poses an important public health problem and highlights the need to restrict gun ownership.
An important limitation in this study is the choice of comparison group. Comparing intimate femicidesuicide to intimate-femicide cases results in the contribution of common risk factors being rendered invisible. This factor is compounded by data being obtained from police sources. This could result in data being incomplete while also being limited in scope at times.
South Africa has a rate of intimate femicidesuicide that greatly exceeds reported rates elsewhere and clearly reflects the high rate of intimate femicide. We have shown that intimate-femicide perpetrators are more likely to commit suicide if they are white or of a higher socioeconomic status. Gun ownership is a very important risk factor for intimate femicidesuicide. The World report on violence and health reports on the risks posed by guns in the home for both intimate femicide and suicide. It recommends legislation on restricting ownership of guns as a form of primary prevention.20 This study once again highlights the public health risk posed by legal gun ownership and the importance of restricting access to guns.
Funding: The study was funded from the South Africa Medical Research Council baseline research funds.
Competing interests: None declared.
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(Submitted: 8 May 2007 Revised version received: 14 September 2007 Accepted: 11 October 2007 Published online: 30 May 2008)