Table 2.

Incidences of adverse drug events, medication errors and preventable adverse drug events

Unit	n	Patient-days	ADEs	Incidencea	95 % CI	Crude rateb	95 % CI
Acute	341	16834	725	43.1	40.0–46.1	213	179–246
Nursing	75	4480	157	35.0	29.7–40.4	209	144–275
Medical	32	1419	73	51.4	40.0–62.9	228	88.6–368
Total	448	22733	955	42.0	39.4–44.6	213	184–243
Unit	n	Patient-days	Medication Errors	Incidencea	95 % CI	Crude rateb	95 % CI
Acute	341	16834	262	15.6	13.7–17.4	76.8	62.0–91.7
Nursing	75	4480	78	17.4	13.6–21.2	104	56.3–152
Medical	32	1419	58	40.9	30.6–51.2	181	73.4–289
Total	448	22733	398	17.5	15.8–19.2	88.8	72.9–105
Unit	n	Patient-days	Preventable ADEs	Incidencea	95 % CI	Crude rateb	95 % CI
Acute	341	16834	86	5.1	4.0–6.2	25.2	16.4–34.1
Nursing	75	4480	38	8.5	5.8–11.2	50.7	17.5–83.8
Medical	32	1419	42	29.6	20.8–38.4	131	35.9–227
Total	448	22733	166	7.3	6.2–8.4	37.1	25.8–48.3

ADEs adverse drug events, CI confidence interval

^aPer 1000 patient-days

^bPer 100 admissions