Table 1.

Incidence estimates of drug related hospital admissions combined over 5 quarters and their sensitivity to a larger source population defined by 70% of cumulative admissions.

		Source population defined by 60% cumulative admissions (25 postal codes)			Source population defined by 70% cumulative admissions (44 postal codes)
Medication group	Number ADRs	Treated patients	Incidence⋆	95% Cl⋆⋆	Treated patients	Incidence	95% Cl
NSAIDs	47	85030	5.53	3.94, 7.11	146416	3.21	2.29, 4.13
Antithrombotics	98	40338	24.30	19.5, 29.1	64071	15.3	12.3, 18.3
Systemic corticosteroids	19	14989	12.68	6.10, 18.4	24624	7.72	4.25, 11.2
ACE inhibitors	14	60875	2.30	1.10, 3.50	102288	1.37	0.65, 2.08
Diuretics	7	37901	1.85	0.47, 3.22	66041	1.06	0.27, 1.85
Digitalis	15	62055	2.42	1.19, 3.64	100153	1.50	0.74, 2.26
Calcium antagonists	19	84097	2.26	1.24, 3.28	134692	1.41	0.78, 2.05
β-adrenoceptor blockers	11	55857	1.97	0.81, 3.13	91822	1.20	0.49, 1.91
Nitrates	13	84612	1.54	0.70, 2.37	144420	0.90	0.41, 1.39
Insulin	34	29327	11.6	7.70, 15.5	47730	7.12	4.73, 9.52
Oral antidiabetics	21	41264	5.09	2.91, 7.27	72429	2.90	1.66, 4.14

^⋆Incidence of drug related hospital admissions per 10 000 treated patients.

^⋆⋆Cl = confidence interval assuming Poisson distributed errors.