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Mean Pittsburgh Sleep Quality Index (PSQI) global score by group at each time point. Mean PSQI global score for mindfulness group (solid line) and control group (dotted line) at baseline and at 6, 12, and 18 months. Error bars represent standard error (SE bars for the mindfuless group are bounded by diamond shapes). Decrease in mean PSQI score indicates improved sleep quality. Intervention began at baseline and lasted 5.5 months.
