Fig. 3From: Circadian rhythm and sleep alterations in older people with lifetime depression: a case-control studyDifferences in subjective sleep quality assessed using Pittsburgh Sleep Quality Index (a), and latency to REM sleep (b) measured using polysomnography between depression cases and controls. Grey circles are depression patients and black diamonds are controls. Points show individual values, middle line is the mean and error bars are the standard deviationBack to article page