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Updated: Jun 27, 2026

Multi-Modal Home Sleep Monitoring in Older Adults
Published on: January 26, 2019
[Insomnia Severity Index: some indicators about its reliability and validity on an older adults sample]
J C Sierra1, V Guillén-Serrano, P Santos-Iglesias
1Universidad de Granada, Facultad de Psicología, Granada, España. jcsierra@ugr.es
Introduction:
The Insomnia Severity Index (ISI) is a short instrument developed to assess insomnia severity from which there is no study in Spain that guarantees its psychometric properties.
Aim:
To examine the reliability, factorial structure, and convergent and discriminant validity of the Spanish version of the ISI in an older adult sample.
Subjects And Methods:
A sample of 230 older adults, aging from 56 to 87 years old (71,11 +/- 5,56) filled in the ISI, together with Athens Insomnia Scale-5 (AIS-5) and Mini Mental State Examination (MMSE).
Results:
Principal component analysis shows only one factor which explains 68.99% of total variance, with an internal consistency reliability equals 0.91. Regarding its validity, ISI shows statistically significant positive correlations with AIS-5 (r = 0.93) and negative with MMSE (r = -0.15). Moreover, it differentiates between men and women, people with and without cognitive impairment, and people with and without medical treatment.
Conclusion:
First data of the Spanish version of the ISI endorse single-dimensional structure, with an appropriate internal consistency reliability, and evidences of its measures validity.
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