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Previous research has shown that traumatic life events are associated with a diagnosis of psychosis. Rather than focus on particular events, this study aimed to estimate the effect of cumulative traumatic experiences on psychosis. The study was based on 2 large community samples (The National Comorbidity Survey [NCS], The British Psychiatric Morbidity(More)
BACKGROUND Polydrug use potentially increases the likelihood of harm. As little is known about polydrug use patterns in the general population, it is difficult to determine patterns associated with highest likelihood. METHODS Latent class analysis was performed on nine illicit substance groups indicating past year use of cannabis, cocaine, amphetamines,(More)
PURPOSE This study assessed the distribution of posttraumatic stress disorder (PTSD) symptoms and psychosis indicators among a large sample of individuals with a lifetime diagnosis of PTSD. The identification of a psychotic PTSD subtype was also predicted. METHOD Using data from the National Comorbidity Survey a latent class analysis was conducted on the(More)
Previous research investigating the etiology of psychosis has identified risk factors such as childhood sexual abuse and cannabis use. This study investigated the multiplicative effect of these variables on clinically assessed diagnoses of psychosis based on a large community sample (the National Comorbidity Survey). Demographic variables (sex, age,(More)
BACKGROUND Cannabis consumption continues to be identified as a causal agent in the onset and development of psychosis. However, recent findings have shown that the effect of cannabis on psychosis may be moderated by childhood traumatic experiences. METHOD Using hierarchical multivariate logistic analyses the current study examined both the independent(More)
OBJECTIVE Numerous studies of both clinical and large-scale population based samples have demonstrated that adverse childhood events are risk factors for subsequent psychosis. This study assessed the relationships between adverse childhood events and auditory and visual hallucinatory experiences. METHOD The study analysed data from the National(More)
Clinically defined psychosis is recognizable and distinguishable from nonclinical or subclinical psychosis by virtue of its clinical relevance (ie, its associated distress and its need for care and/or treatment). According to the continuum hypothesis, subclinical psychosis is merely quantitatively different from more extreme phenotypic expressions and as(More)
PURPOSE Research has shown that sexual trauma represents a specific threat for psychosis, particularly among females. Sexual trauma among females, however, has also been shown to enhance the risk for further revictimisation. Females are likely to exhibit distinct lifetime trauma profiles, i.e. female sexual trauma victims are often more likely to experience(More)
BACKGROUND Exposure to traumatic events has been implicated in the onset and development of a range of psychiatric disorders. People can be exposed to multiple traumatic events and previous research suggests that traumatic experiences may cluster at the individual level. METHODS This study aimed to examine the distribution of traumatic experiences in a(More)
AIMS To identify population-based clinical and demographic correlates of alcohol use dimensions. METHODS Using data from a population-based sample of Great Britain (n = 7849), structural equation modelling (SEM) was used to identify associations between demographic and clinical variables and two competing dimensional models of the Alcohol Use Disorders(More)