Table 2.

Comparison of percent ischemic heart disease mortality (with 95% confidence intervals) at 15 years of follow-up between women with left-sided and right-sided breast cancers, stratified by stage of disease at time of diagnosis

	All patients			Patients with in situ/localized disease			Patients with regional disease
Cohort by year of diagnosis	Left-sided, %	Right-sided, %	P	Left-sided, %	Right-sided, %	P	Left-sided, %	Right-sided, %	P
Overall	8.7 (8.0 to 9.3)	7.5 (6.9 to 8.2)	.07	7.6 (6.7 to 8.4)	6.7 (5.9 to 7.5)	.40	10.2 (9.1 to 11.3)	8.6 (7.6 to 9.6)	.09
1973–1979	13.1 (11.6 to 14.6)	10.2 (8.9 to 11.5)	.02	12.7 (10.3 to 15.2)	9.6 (7.5 to 11.8)	.14	13.3 (11.5 to 15.1)	10.6 (8.9 to 12.3)	.06
1980–1984	9.4 (8.1 to 10.6)	8.7 (7.4 to 10.0)	.64	8.9 (7.2 to 10.5)	8.7 (7.1 to 10.4)	.87	10.0 (7.9 to 12.1)	8.8 (6.8 to 10.9)	.38
1985–1989	5.8 (4.8 to 6.7)	5.2 (4.4 to 5.9)	.98	5.7 (4.5 to 6.8)	4.9 (4.0 to 5.8)	.79	6.0 (4.4 to 7.6)	5.7 (4.1 to 7.2)	.76