Validation of the insomnia severity index as a web-based measure.

Publication Type:

Journal Article


Behav Sleep Med, Volume 9, Issue 4, p.216-23 (2011)


Adult, Female, Humans, Internet, Male, Middle Aged, Psychometrics, Reproducibility of Results, Severity of Illness Index, Sleep Initiation and Maintenance Disorders, Surveys and Questionnaires


<p>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.</p>

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