title: Characteristics of individuals with insomnia who seek treatment in a clinical setting versus those who volunteer for a randomized controlled trial.
abstract: The generalizability of outcome data derived from insomnia clinical trials is based largely on the extent to which research volunteers resemble clinical patients. This study compared sociodemographic, sleep, psychological, and medical characteristics of individuals who volunteered for an insomnia treatment study (n = 120) to patients who sought treatment in a clinical setting (n = 106). The samples did not differ on most sleep and medical variables, but clinical patients had a higher prevalence of mood disorders, greater anxiety and depression symptoms, and higher perceived insomnia severity. Differences on psychological variables were accentuated by the research selection process. It is suggested to minimize exclusion based on psychological comorbidity in order to enhance ecological validity of randomized controlled trials of insomnia treatments.
authors.affiliation: Department of Psychology, Queen's University, Kingston, Ontario, Canada.
authors.forename: Judith R
authors.initials: JR
authors.lastname: Davidson
authors.forename: Annie
authors.initials: A
authors.lastname: Aime
authors.forename: Hans
authors.initials: H
authors.lastname: Ivers
authors.forename: Charles M
authors.initials: CM
authors.lastname: Morin
mesh_terms: D000328:Adult; D001007:Anxiety / Q000150:complications; D015897:Comorbidity; D003863:Depression / Q000150:complications; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019964:Mood Disorders / Q000150:complications; D010342:Patient Acceptance of Health Care; D011586:Psychology, Clinical; D016032:Randomized Controlled Trials as Topic; D012720:Severity of Illness Index; D007319:Sleep Initiation and Maintenance Disorders / Q000150:complications / Q000523:psychology* / Q000628:therapy*