Table 4.

Estimates of odds ratios for aplastic anaemia among cases and possible cases.

Exposure⋆	Cases (n = 13)	Controls (n = 77)	Odds ratio	95% CI
Nonexposed⋆⋆	4	15	1.0	Reference
CCBs	1	12	0.3	0.02, 3.3
β-adrenoceptor blockers	3	25	0.5	0.1, 2.5
ACE inhibitors	2	9	0.7	0.1, 5.6
Other	2	6	1.2	0.1, 11.8
Multiple study drugs with CCBs	1	6	0.7	0.1, 7.2
Multiple study drugs without CCBs	0	4	–	–

^⋆Exposure categories are mutually exclusive.

^⋆⋆Reference group.