Original articleThe Prevalence and Correlates of Nonaffective Psychosis in the National Comorbidity Survey Replication (NCS-R)
Section snippets
Sample
The NCS-R is a nationally representative, face-to-face household survey of adults (ages 18+) (Kessler et al 2003, Kessler et al 2004). A total of 9282 respondents participated in the survey (February 2001 - December 2003). The response rate was 70.9%. Participants received $50 for participation. Verbal rather than written consent was used in order to be consistent with the recruitment procedures in the baseline NCS (Kessler et al 1994). The Human Subjects Committees of Harvard Medical School
Screening Question Responses
NAP screening questions were endorsed by 9.1% of respondents (Table 1). The most commonly endorsed symptoms were visual (6.3%) and auditory (4.0%) hallucinations; the least commonly were thought control (.1%) and thought insertion (.4%). Clinical review of open-ended CIDI responses concluded that 16.8% of respondents who endorsed symptom questions were probable cases of NAP, which would yield a lifetime prevalence estimate of 1.5%. The proportions classified probable were much lower for visual
Discussion
The 1.5% lifetime prevalence estimate of probable NAP based on preliminary clinical review of CID open-ended responses is in the middle of the range of prevalence estimates in past community epidemiological surveys (Bland et al 1988, Canino et al 1987, Hwu et al 1989, Keith et al 1991, Kendler et al 1996, Lee et al 1990, Wells et al 1989, Wittchen et al 1992). This was achieved, though, using a much smaller set of screening questions than in previous surveys as well as with a much smaller
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