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Histogram for unadjusted patient wake-up time (WUT) from general anesthesia for all cases (n = 7687). The distribution of wake-up time followed a Weibull distribution (curved line) with a scale (α) of 9.8 ± 0.1 and shape (β) 1.6 ± 0.2. Errors bars represent 95% confidence interval estimates for the true number of cases per minute value for emergence time
