Psychometric Properties of the Pittsburgh Sleep Quality Index (PSQI) in Patients with Multiple Sclerosis: Factor Structure, Reliability, Correlates, and Discrimination

Scientific paper - Original scientific paper

• Author: Ana Jerković https://orcid.org/0000-0002-6292-4124
• Author: Una Mikac
• Author: Meri Matijaca
• Author: Vana Košta
• Author: Ana Ćurković Katić
• Author: Krešimir Dolić
• Author: Igor Vujović
• Author: Joško Šoda
• Author: Zoran Đogaš
• Author: Sanda Pavelin
• Author: Maja Rogić Vidaković
• Author's institution: (University Hospital of Split)
• Author's institution: University of Split; School of Medicine
• Author's institution: University of Split; Faculty of Maritime Studies
• Author's institution: University of Zagreb; Faculty of Humanities and Social Sciences; (Department of Psychology)
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Clinical Medical Sciences
• Scientific / art field, discipline and subdiscipline: SOCIAL SCIENCES; Psychology; Clinical and Health Psychology

Abstract (english)

Sleep disturbances and poor sleep are a common complaint in the population with multiple sclerosis (MS) disease. The most commonly reported scale is the Pittsburgh Sleep Quality Index (PSQI), measuring seven components of sleep quality. Yet, till today, the PSQI instrument has not been validated in people with multiple sclerosis (pwMS). The objective of our study was to add precision in sleep quality assessment by investigating the psychometric properties of PSQI (factor structure, reliability, validity based on relations with other variables, cut-off scores) in pwMS. The cross-sectional study included data on a total of 87 patients with MS and 216 control subjects. Demographic information, education level, and MS-related variables were ascertained. Psychometric properties were examined by estimating the validity, including factor structure, metric invariance, and relations with other MS- and non-MS-related variables, reliability, and discrimination ability of the PSQI. The Croatian version of the PSQI had a two-factor structure which demonstrated loading and partial intercept invariance between pwMS and the control group. The global score and both subscales had high internal consistencies (McDonald’s omega and Cronbach’s alpha coefficients) in pwMS and showed expected relations with demographic and MS-related variables. PwMS differed significantly in the PSQI global score from the control groups, although receiver operating characteristics (ROC) curve analysis did not indicate a clear cut-off point. The PSQI is a reliable and valid scale and can be applied in clinical settings for assessing sleep quality in pwMS.

• Keywords (english): Pittsburgh Sleep Quality Index (PSQI); multiple sclerosis; sleep; validation; reliability
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Journal of Clinical Medicine
• Numbering: vol. 11, 2037
• e-ISSN: 2077-0383
• DOI: https://doi.org/10.3390/jcm11072037
• URN:NBN: urn:nbn:hr:131:909649
• Publication: 2022-04-05
• Document URL: https://www.mdpi.com/2077-0383/11/7/2037
• Type of resource: Text
• Access conditions: Open access
• Created on: 2022-04-28 10:36:38