Original articleSleep Problems, Comorbid Mental Disorders, and Role Functioning in the National Comorbidity Survey Replication
Section snippets
Sample
The NCS-R is a nationally representative, face-to-face household survey of adults (ages 18+) based on a multi-stage clustered area probability sampling design (Kessler et al 2004c). A total of 9282 respondents participated in the survey (February 2001 to December 2003). The response rate was 70.9%. Participants received a $50 honorarium. After complete description of the study to potential respondents, verbal informed consent was obtained. Consent was verbal rather than written in order to be
Prevalence, Inter-Correlations and Duration
Twelve-month prevalence estimates are 16.4% for DIS, 19.9% for DMS, 16.7% for EMA, and 25.0% for NRS (Table 1). The proportion of the sample with one or more of these four problems is 36.3%. The fact that the latter proportion is much less than the sum of the four problem-specific proportions (which would be the prevalence of having any of the four if no single individual had more than one sleep problem) indirectly indicates that the four problems are strongly interrelated. This can be seen
Discussion
These results have to be interpreted with three limitations in mind. First, while duration of sleep problems was assessed over the past 12 months in order to study the extent to which these problems are persistent over the course of a year, concerns about recall bias in reports about days out of role and role functioning led us to assess impairment over the shorter recall period of the past 30 days. This lack of comparability in time frames is likely to have introduced a conservative bias into
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