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Abstract
The Pittsburgh Sleep Quality Index (PSQI) measures sleep quality and disturbance retrospectively
over a 1-month period using self-reports. Although the PSQI has been used in a variety
of populations, published psychometric data are limited. The goal of this study was
to examine psychometric properties of the PSQI among four populations: bone marrow
transplant patients (n=155); renal transplant patients (n=56); women with breast cancer
(n=102); and women with benign breast problems (n=159). Results supported PSQI internal
consistency reliability and construct validity. Cronbach's alphas were 0.80 across
groups and correlations between global and component scores were moderate to high.
PSQI scores were moderately to highly correlated with measures of sleep quality and
sleep problems, and poorly correlated with unrelated constructs. Individuals with
sleep problems, poor sleep quality, and sleep restlessness had significantly higher
PSQI scores in comparison to individuals without such problems.