Table 3.

RR(95% CI) of breast cancer death according to current aspirin use, among all women, and stratified by COX-2 expression

Among	N/# breast cancer deaths	Type of adjustment	RR	95% CI
All women	2001/473	simple*	0.58	0.48–0.71
		multivariable**	0.61	0.50–0.75
COX2+	561/160	simple*	0.60	0.42–0.85
		multivariable**	0.64***	0.43–0.96
COX2−	1440/313	simple*	0.56	0.44–0.72
		multivariable**	0.57***	0.44–0.74

^*Adjusted for time since diagnosis and age

^**Adjusted for the same factors as the multivariable model in Table 2 including disease stage at diagnosis

^***p-value for the interaction = 0.44