Psychometric properties of the Turkish version of modified Freedman questionnaire for sleep quality

To investigate the psychometric characteristics of the modified Freedman Sleep Quality Questionnaire (mFSQQ) to assess sleep in Turkish intensive care unit (ICU) patients. This prospective cross-sectional study was conducted between December 2020 and August 2021 with patients older than 18 years, who stayed in the ICU for >= 24 h and were cooperative with a Glasgow Coma Scale score >= 10 in medical and surgical ICUs of a university hospital. During the adaptation of the items of the mFSQQ, language, content, and construct validity were examined, and the test-retest method and internal consistency were used to examine its reliability. The content validity index of the questionnaire was 0.82. The Kaiser-Meyer-Olkin measure of sampling adequacy was 0.71, which indicates adequate sampling; Bartlett's test of sphericity was chi(2) = 2868.97, p < 0.001. The Turkish version had three subscales. The factor loadings of the items were above 0.30, and the factors explained 60.59% of the total variance. The test-retest reliability coefficient was 0.85, indicating high consistency. The Cronbach alpha reliability coefficient was 0.80, indicating high reliability. The item-total correlations were found to be sufficient (between 0.25 and 0.78). The Turkish version of the mFSQQ showed good psychometric characteristics and can be used as a routine evaluation instrument to determine sleep quality by the ICU team and to promote sleep.