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Prevalence of clinical insomnia among chronic pain patients and age- and sex-matched pain-free controls. The presence of clinical insomnia was determined by the validated scores of the Insomnia Severity Index (ISI), (17); ISI score 0–7 = no clinically significant insomnia, ISI score 8–14 = sub-threshold insomnia, ISI score 15–21 = moderate clinical insomnia, ISI score 22–28 = severe clinical insomnia.
