Development of a slovenian version of the pittsburgh sleep quality index (PSQI-SLO) for use with older adults.

BACKGROUND

Poor sleep quality predicts poor quality of life, poor self-rated health, and chronic diseases and mental disorders among older adults. The Pittsburgh Sleep Quality Index (PSQI) is the most widely used self-report measure of sleep quality in older adults.

OBJECTIVES

This study aimed to assess internal reliability, face validity, content validity and internal consistency of the Slovenian version of the PSQI (PSQI-SLO) for sleep quality in older adults.

METHODS

A cross-sectional study was used to evaluate content and face validity as well as reliability (ɑ, ω and item-total correlations). Residents of 13 nursing homes and community-dwelling older adults from all regions of Slovenia were sampled. A total of 831 participants aged 65 years and older participated in the study between March and August 2019.

RESULTS

All items were successfully translated to Slovenian. A minor cultural adaptation was made to improve the clarity of the meaning of all items. None of the items had an item content validity index (I-CVI) score lower than 0.50. Kappa indices were excellent for half of the items and good for the remainder. Internal consistency agreed with prior research (ɑ = 0.74). Intraclass correlation coefficient for global PSQI-SLO was 0.62 (p < 0.001). The total score of PSQI-SLO (8.09 ± 3.64 (95%, CI = 7.85-8.34)) was expected and comparable. Fifty-eight and four tenths' per cent (95%, CI = 55%-62%) had at least one chronic disease and 40% (95%, CI = 37%-42%) lived in a nursing home.

CONCLUSIONS

PSQI-SLO showed adequate internal consistency and test-retest reliability, and adequate construct and criterion validity. The instrument can be important in assessing older adults' subjective sleep quality in nursing homes, home environment and clinical settings.