Table 2.

Prevalence ratios with 95% CI for use of secondary prevention medications for CHD according to time since last diagnosis before 2003

	Myocardial infarction cases*			Angina only cases
	N=336			N=521
Medication type	N	n (%)	Prevalence ratio (95% CI)	N	n (%)	Prevalence ratio (95% CI)
Aspirin  Time since diagnosis   < 5 years   5-10 years   10 or more	81 101 154	72 (89) 90 (89) 121 (79)	1.00 1.00 (0.90, 1.11) 0.88 (0.79, 0.99)	246 156 119	180 (73) 118 (76) 73 (61)	1.00 1.03 (0.92, 1.16) 0.84 (0.71, 0.99)
Statins  Time since diagnosis   < 5 years   5-10 years   10 or more	81 101 154	62 (77) 64 (63) 93 (60)	1.00 0.86 (0.68, 1.00) 0.79 (0.66, 0.94)	246 156 119	130 (53) 78 (50) 49 (41)	1.00 0.95 (0.77, 1.15) 0.78 (0.61, 0.99)
ACE inhibitors  Time since diagnosis   < 5 years   5-10 years   10 or more	81 101 154	47 (58) 43 (43) 57 (37)	1.00 0.73 (0.55, 0.98) 0.64 (0.48, 0.84)	246 156 119	81 (33) 46 (29) 28 (24)	1.00 0.89 (0.66, 1.21) 0.71 (0.49, 1.03)
Beta blockers  Time since diagnosis   < 5 years   5-10 years   10 or more	81 101 154	56 (69) 39 (39) 52 (34)	1.00 0.56 (0.42, 0.74) 0.48 (0.37, 0.64)	246 156 119	99 (40) 59 (38) 32 (27)	1.00 0.94 (0.73, 1.21) 0.67 (0.48, 0.93)

^*Myocardial infarction cases include those with or without angina;

N – total in each category; n – prevalence of medication use in each category