Because trauma can be causative of psychiatric disorders, it is important to be clear about the direction of causality in research concerning sexual trauma and major mental disorders. Our interest for this editorial concerns the risk of sexual violence against patients with established major mental disorders. Studies that survey patients regarding whether or not they had been victims of sexual violence within a broad time frame of adulthood cannot clearly establish whether the patients were already diagnosed with serious mental disorders before becoming victims of sexual violence [10].
One recently conducted, and high-quality systematically conducted, review reported on 30 studies on recent violence by any perpetrator against people with serious mental disorders [11]. Within this review, eight studies reported on the prevalence of various forms of sexual violence against women within the previous year with a median prevalence rate of 10% [12,13,14,15,16,17,18,19]. Our own search found three additional studies [20,21,22].
Of these 11 studies, four were conducted in the USA [12, 13, 15, 20], two in Sweden [14, 18], two in Britain [16, 21], two in the Netherlands [17, 22], and one in Greece [19]. The study samples included predominantly patients with schizophrenia or other psychotic disorders and bipolar or depressive disorders, although one provided data on patients who were currently depressed [22]. Response rates were greater than 70% for six of the studies [12,13,14,15, 18, 21], and six of the studies compared their data on sexual violence with comparison groups including the general population of individuals who were not mentally ill [13, 16, 17, 19, 21, 22]. Ten of the studies [12,13,14,15,16,17,18,19, 20, 21] assessed the rate of sexual violence over a 1-year period, with sexual violence usually being broadly defined, although two studies also provided data specifically about rape [12, 18]. One study assessed patients in an urban emergency department who had presented with a chief complaint of sexual assault [20]. In this study, a major psychiatric diagnosis was found in 26% of the 819 women. These studies together found high rates of sexually violent acts perpetrated against women with major mental disorders [12,13,14,15,16,17,18,19,20,21,22]. Overall, people with major mental disorders were at greater risk of sexual violence than comparison groups who did not have major mental disorders [13, 16, 17, 19, 21, 22]. We did not find information on risks of becoming sexually trafficked among women with major mental disorders.
Although there is little information, risk factors associated with sexual victimization of persons with major mental disorders include homelessness, alcohol or substance abuse/misuse, and illness severity [23, 24]. Concomitant physical, intellectual, social, and interpersonal disabilities also pose significant risks for sexual assault. Women with mental health disorders who are at the mercy of caregivers or who are easily overpowered are more vulnerable to sexual abuse. Furthermore, in many instances, because of their cognitive or communication deficits, they are less likely to be able to report abuse.
It would be expected that violent acts against patients with major mental disorders would exacerbate their mental health problems. Depression, anxiety disorders, posttraumatic stress disorder, and alcohol and substance use are potential consequences of stressful adversities. In one of the studies [16], female victims with major mental disorders were more likely to report adverse psychological/social effects than those victims without a major mental disorder. In another study [20], assaults on women with a major psychiatric diagnosis were more violent and resulted in body trauma more frequently than assaults on women without a psychiatric diagnosis.