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Letters |19 January 2016

Cognitive Behavioral Therapy for Chronic Insomnia

James M. Trauer, MBBS; David Cunnington, MBBS

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In relation to the definition and duration of insomnia, the terms that we accepted as indicating chronic insomnia are listed in the Supplement and Table 3 presents the sources that the individual studies referenced to obtain their definitions. The 2 studies with insomnia definitions listed as “author-defined” required a duration of 1 month (1) and 6 months (2), and both the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, and the research diagnostic criteria for insomnia disorder require a duration of at least 1 month (3, 4). Therefore, the minimum duration of insomnia required for entry into any of the studies included in our review was 1 month. Nine of the studies reported a mean duration of insomnia among participants, which ranged from 9.5 to 14.3 months, except for 1 study that did not contribute data to pooled estimates (5) that reported a mean duration of 4.1 months.
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Trauer JM, Cunnington D. Cognitive Behavioral Therapy for Chronic Insomnia. Ann Intern Med. 2016;164:134–135. doi: 10.7326/L15-0484

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Published: Ann Intern Med. 2016;164(2):134-135.

DOI: 10.7326/L15-0484

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