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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Pharmacoepidemiol Drug Saf. 2010 Sep;19(9):901–910. doi: 10.1002/pds.1984

Figure 1. National Incidence of Adverse Drug Events Treated in U.S. Outpatient Clinics and Emergency Departments, 1995–2005.

Figure 1

A, Mean annual incidence of adverse drug event cases treated in outpatient clinics was 12.7 per 1000 persons (95% CI, 11.5– 14.2); P value for trend <0.001. Mean annual incidence of adverse drug event cases treated in emergency departments was 2.8 (95% CI, 2.6– 3.1) per 1000 persons; P value for trend =0.70. B, Mean annual incidence of adverse drug event cases treated in outpatient clinics and emergency departments was 13.2 per 1000 persons (95% CI, 11.5–14.9) between 1995 and 2000 and 18.1 per 1000 persons (95% CI, 15.6–20.5) between 2001 and 2005. P value for trend with increasing age was <0.001 during both time periods. Error bars indicate 95% confidence intervals.