Reliability and Validity of the Pittsburgh Sleep Quality Index-Serbian Translation.

The aim of this study was translating and exploring psychometric properties of Serbian Pittsburgh Sleep Quality Index (PSQI) in a sample of "good" and "bad" sleepers suffering from depression or obstructive sleep apnea (OSA). Formal translation and validation were performed on a sample of healthy controls, patients with untreated OSA, and with diagnosed major depressive disorder with evaluation of internal consistency, test-retest reliability, and construct and criterion validity. Controls and OSA subgroups were recruited from a larger sample of commercial drivers.