A 2005 meta-analysis of schizophrenia revealed that the prevalence of physical and sexual abuse in the histories of people diagnosed with psychotic disorders is very high and has been understudied. This literature review revealed prevalence rates of childhood sexual abuse in studies of people diagnosed with schizophrenia ranging from 45% to 65%. An analysis of the American National Comorbidity Study revealed that people who have endured three kinds of abuse (e.g., sexual, physical, bullying) are at an 18-fold higher risk of psychosis, whereas those experiencing five types are 193 times more likely to become psychotic. A 2012 review article supported the hypothesis that current or recent trauma may affect an individual's assessment of the more distant past, changing the experience of the past and resulting in dissociative states. Several reviews of risk factors for common mental disorders have emphasised trauma. Such research has rejuvenated interest in this field, both from clinicians, researchers and service user organisations such as the Hearing Voices movement.