Predictors of competing mortality to invasive breast cancer incidence in the Canadian National Breast Screening study

Table 8 Adjusted risk for all statistically significant factors for non-cancer mortality

Variable	Parameter Estimate	HR (95% CI)	P-value
Age at entry	0.11412	1.12 (1.10-1.14)	<.0001
Length of estrogen/progesterone used (months)	−0.00293	0.997 (0.994-1.000)	0.0398
Ethnic origin (Ref^*: Canada)
Foreign	−1.51760	0.22 (0.10-0.46)	<.0001
Had a hysterectomy (Ref: No)
Yes	0.28427	1.33 (1.07-1.65)	0.0093
Cigarettes smoked per day (Ref: 0 per day)			<.0001
Occasionally	0.08311	1.09 (0.51-2.32)
1-5 per day	0.27274	1.31 (0.88-1.96)	0.8298
6-10 per day	0.23232	1.26 (0.88-1.81)	0.1789
11-25 per day	0.59759	1.82 (1.43-2.31)	0.2057
26-50 per day	0.96370	2.62 (1.83-3.75)	<.0001
>50 per day	1.76857	5.86 (2.40-14.30)
			<.0001
			0.0001
Ever noted lumps in breasts (Ref: No)
Yes	0.49413	1.64 (1.14-2.36)	0.0080
Ever noted discharge from breasts (Ref: No)
Yes	0.70502	2.02 (1.20-3.40)	0.0079