Improving drug safety in hospitals: a retrospective study on the potential of adverse drug events coded in routine data

Table 2 Classification of ADEs per ADE code: absolute and relative frequencies

Group	N[%] cases per ADE code
Group	A04.7	D68.33	D68.34	D68.35	D69.52	D69.53	I95.2	K52.1	L27.0	L27.1	N99.0	Total	95% CI
G0 - event without drug relationship	15 [7.1]	0	0	0	0	0	0	0	0	0	2 [1.9]	17 [1.3]	0.8–2.1
G1 - known npADE	195 [92.9]	42 [91.3]	7 [100]	12 [100]	9 [100]	41 [100]	401 [99.0]	87 [98.9]	209 [93.7]	138 [89.6]	103 [96.2]	1244 [95.6]	94.3–96.6
G2 – previously unknown npADE	0	0	0	0	0	0	0	1 [1.1]	0	2 [1.3]	0	3 [0.2]	0.1–0.7
G3 - pADE	0	4 [8.7]	0	0	0	0	3 [0.7]	0	14 [6.3]	14 [9.1]	2 [1.9]	37 [2.8]	2.0–3.9
G4 – event after drug abuse	0	0	0	0	0	0	1 [0.3]	0	0	0	0	1 [0.1]	0–0.4
Total	210	46	7	12	9	41	405	88	223	154	107	1302

npADE non-preventable adverse drug event, pADE preventable adverse drug event, CI confidence interval

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