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Validation study of the Italian version of the Insomnia Severity Index (ISI)
- Source :
- Neurological Sciences. 37:1517-1524
- Publication Year :
- 2016
- Publisher :
- Springer Science and Business Media LLC, 2016.
-
Abstract
- To test the factorial structure of the Italian version of the Insomnia Severity Index (ISI) using a confirmatory approach and to assess its psychometric properties. ISI questionnaire was completed by 272 patients (average age 41.28, range 18-73) with insomnia diagnosis performed by a sleep medicine physician and retrospectively enrolled in the study. All patients underwent Cognitive Behavioral Treatment for Insomnia (CBT-I) and completed sleep diaries before starting the treatment. Data from sleep diaries were analyzed for assessing concurrent validity of the ISI. Confirmatory factor analysis (CFA) for ordinal Likert-type items was applied to compare four competing models proposed in the literature. 244 patients, out of the 272, completed the ISI at the end of CBT-I. A comparison of ISI score before and after treatment was performed. The CFA analysis confirmed the presence of three main factors conceptualized as severity and impact of the disease along with sleep satisfaction. Significant correlations of the first three items of the questionnaire, investigating three different subtypes of insomnia, and the subjective measures from the sleep diaries were found, thus supporting the concurrent validity of the test. Sleep efficiency (SE) had a significant inverse correlation with the severity and satisfaction factors and with ISI's total score. After CBT-I treatment, a significant reduction of ISI's scores was observed, thus confirming the effectiveness of the CBT-I treatment. The internal reliability coefficient was 0.75. The ISI questionnaire maintains good psychometric properties in the Italian version, thus confirming that this instrument is reliable for detecting insomnia severity and identifying patients' symptoms.
- Subjects :
- Adult
Male
medicine.medical_specialty
Neurology
Adolescent
Psychometrics
Concurrent validity
Dermatology
Cognitive behavioral therapy for insomnia
Severity of Illness Index
Sleep medicine
Young Adult
03 medical and health sciences
0302 clinical medicine
Sleep Initiation and Maintenance Disorders
Outcome Assessment, Health Care
medicine
Insomnia
Humans
030212 general & internal medicine
Aged
Retrospective Studies
Cognitive Behavioral Therapy
Reproducibility of Results
General Medicine
Middle Aged
Translating
humanities
Confirmatory factor analysis
Test (assessment)
Psychiatry and Mental health
Italy
Physical therapy
Female
Sleep diary
Neurology (clinical)
medicine.symptom
Factor Analysis, Statistical
Psychology
030217 neurology & neurosurgery
Clinical psychology
Subjects
Details
- ISSN :
- 15903478 and 15901874
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Neurological Sciences
- Accession number :
- edsair.doi.dedup.....6ef91f8c1ce5c22d79158aeebc4f2a42