• J C Sierra, V Guillén-Serrano, and P Santos-Iglesias.
• Universidad de Granada, Facultad de Psicología, Granada, España. jcsierra@ugr.es
• Rev Neurol. 2008 Dec 1; 47 (11): 566-70.

IntroductionThe 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.AimTo examine the reliability, factorial structure, and convergent and discriminant validity of the Spanish version of the ISI in an older adult sample.Subjects And MethodsA 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).ResultsPrincipal 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.ConclusionFirst 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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