Insomnia Severity Index (ISI)

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Introduction

Designed as a brief screening tool for insomnia, the seven-item questionnaire asks respondents to rate the nature and symptoms of their sleep problems using a Likert-type scale. Questions relate to subjective qualities of the respondent’s sleep, including the severity of symptoms, the respondent’s satisfaction with his or her sleep patterns, the degree to which insomnia interferes with daily functioning, how noticeable the respondent feels his or her insomnia is to others, and the overall level of distress created by the sleep problem. 

The scale has been validated on two separate insomnia patient populations with ages ranging from 17 to 84. Administration Requiring only about 5 min for completion, the brief scale is a self-report measure administered with pencil and paper.

Use the following EVALUATION FORM to evaluate your patient and PRINT THE FORM when the evaluation is completed.



Reliability and Validity 

Developers Bastien and colleagues [ 1]performed an initial psychometric study and demonstrated an internal consistency of a = .74 and found item-total correlations that were quite variable, ranging from .36 to .54.

Reference

1. Bastien, C. H., Vallières, A., & Morin, C. M. (2001). Validation of the insomnia severity index as an outcome measure for insomnia research. Sleep Medicine, 2 , 297–307.

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