Assessing the Factor Structure and Measurement Invariance of the Pittsburgh Sleep Quality Index Between Postmenopausal Breast Cancer Survivors and Controls.
Paul W Scott, Cassandra M Godzik, Jonna L Morris, Eileen R Chasens, Catherine M Bender
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Abstract
Background and Purpose: This study evaluates the Pittsburgh Sleep Quality Index (PSQI) in terms of factor structure and measurement invariance (MI). The sample included postmenopausal breast cancer (BC) survivors (n = 101) and matched healthy controls (n = 60). Methods: Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were performed on PSQI's seven component scores. MI was tested between groups and across time using Bayes factor (BF). Results: Two factors were identified: sleep efficiency and perceived sleep quality. MI is evidenced between groups (BF < 0.007) and over time (BF > 150). Conclusions: PSQI scores with two subscales are comparable between postmenopausal BC survivors and controls over a 1-year period, providing some validation of PSQI for researching sleep quality in this population.
期刊介绍：
The Journal of Nursing Measurement specifically addresses instrumentation in nursing. It serves as a prime forum for disseminating information on instruments, tools, approaches, and procedures developed or utilized for measuring variables in nursing research, practice, and education. Particular emphasis is placed on evidence for the reliability and validity or sensitivity and specificity of such instruments. The journal includes innovative discussions of theories, principles, practices, and issues relevant to nursing measurement.
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