.7% of all patients in 2003 to 8.4% in 2006. Admitted patients were more likely than discharged ones to leave the ED in the last 20 minutes, and the relative likelihood increased each year after 2003, with incidence rate ratio 1.04 (95% confidence interval [CI] 0.78 to 1.39), 1.39 (95% CI 1.05 to 1.82), and 1.55 (95% CI 1.19 to 2.20) for 2004, 2005, and 2006, respectively