Fig. 4From: Chinese patients’ clinical and psychosocial outcomes in the 6 months following percutaneous coronary interventionPSQI subscale scores over the 6-month follow-up from the percutaneous coronary intervention, n = 491. PSQI = Pittsburgh Sleep Quality Index [18], BL = Baseline, M = month. Note: The PSQI has 7 subscales. Subscale scores range from 0 (no difficulty) to 3 (severe difficulty); Higher scores indicate worse sleep quality. *p < .05, **p < 0.01, ***p < 0.001Back to article page