title: Validation of the insomnia severity index as a web-based measure.
abstract: Although the Insomnia Severity Index (ISI) is already administered online, this frequently used instrument has not been validated for Web delivery. This study compares online and paper-and-pencil ISI versions completed by participants in a randomized controlled trial testing an Internet-delivered intervention for insomnia. Forty-three adults with insomnia completed both ISI versions during pre- (Assessment 1) and post-intervention (Assessment 2). Correlations between total scores of both versions were significant (rs ≥ .98, ps < .001). For both ISI versions, internal consistency was acceptable (Assessment 1, α = .61; Assessment 2, α ≥ .88). Among participants not receiving the parent study intervention, correlations between 1 format at Assessment 1 and the alternative format at Assessment 2 were generally significant (rs = .26-.82). Together, findings suggest the ISI can be delivered online.
authors: Department of Psychiatry and Neurobehavioral Sciences Behavioral Health and Technology, University of Virginia Health System, Charlottesville, USA. fthorndike@virginia.edu
authors: Frances P
authors: FP
authors: Thorndike
authors: Lee M
authors: LM
authors: Ritterband
authors: Drew K
authors: DK
authors: Saylor
authors: Joshua C
authors: JC
authors: Magee
authors: Linda A
authors: LA
authors: Gonder-Frederick
authors: Charles M
authors: CM
authors: Morin
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis*; D011795:Surveys and Questionnaires