Sleep Quality
The Pittsburgh Sleep Quality Index (PSQI) is an index widely used to measure sleep quality. The PSQI is a self-reported questionnaire that includes 19 questions that when scored, are separated into seven domains. The seven domains are; perceived sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, sleep medications; and daytime dysfunction. Each domain is scored from 0-3 and a total score ranging from 0-21 can be obtained. A total score of; 0-4 indicates a good sleep quality, 5-10 indicates poor sleep quality and scores above 10 indicate a possible sleep disorder. This index has been translated to Turkish and validated by Agargun et al [23].