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Forest plot of the risk of death associated with short duration of sleep compared to the reference group in 25 population cohorts from 15 published prospective studies including 1,381,324 participants and 112,163 events. Results are expressed as relative risk (RR) and 95% confidence intervals (95% CI). Pooled analysis P < 0.01; heterogeneity test: I2 = 39%, P = 0.02
