Table 1.

Incidence of Adverse Drug Events

Ward	n	Patient-days	ADEs	Incidence*	95% CI	Crude rate†	95% CI	Annual ADEs‡
Medicine	1,531	25,734	504	19.6	17.9-21.3	32.9	30.6-35.3	4,148
Surgery	1,469	30,419	407	13.4	12.1-14.7	27.7	25.4-30.0	3,218
ICU	459	3,230	99	30.7	24.6-36.7	21.6	17.8-25.3	634

ADE, adverse drug event; ICU, intensive care unit; CI, confidence interval; *per 1,000 patient-days; †per 100 admissions; ‡Extrapolated from number of ADEs and information from three hospitals