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

Behav Sleep Med. 2011;9(4):216-23. doi: 10.1080/15402002.2011.606766.


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.

Publication types

  • Comparative Study
  • Randomized Controlled Trial
  • Research Support, N.I.H., Extramural

MeSH terms

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