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Table 7 Adjusted risk for all statistically significant factors for cancer-specific mortality

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

Variable Parameter Estimate HR (95% CI) P
Age at entry 0.10405 1.11 (1.09-1.13) <.0001
Length of estrogen/progesterone used (months) −0.00308 0.997 (0.995-0.999) 0.0132
Menstruation length (years) −0.01369 0.986 (0.974-0.999) 0.0406
Had a bi-lateral oophorectomy (Ref*: No)    
 Yes 0.29487 1.34 (1.05-1.72) 0.0206
Number of live births (Ref: 1–2)    0.0062
Nulliparous −0.08554 0.92 (0.69-1.22) 0.5574
3-4 −0.30281 0.74 (0.56-0.98) 0.0364
> = 5 −0.77717 0.46 (0.30-0.71) 0.0005
Breast self examination (BSE) practise (Ref: No)    
 Yes −0.17698 0.84 (0.71-0.94) 0.0424
Cigarettes smoked per day (Ref: 0 per day)    <.0001
Occasionally 0.24987 1.28 (0.72-2.30) 0.3998
 1-5 per day −0.01604 0.98 (0.68-1.44) 0.9335
 6-10 per day −0.10999 0.90 (0.63-1.27) 0.5326
 11-25 per day 0.54201 1.72 (1.41-2.10) <.0001
 26-50 per day 1.06327 2.90 (2.19-3.83) <.0001
 >50 per day 1.02201 2.78 (1.03-7.51) 0.0438
Number of pregnancies (Ref: 1–2)    0.0136
 3-4 0.04212 1.04 (0.78-1.40) 0.7812
 5-10 0.20064 1.22 (0.84-1.78) 0.2913
 11-17 1.19964 3.32 (1.58-6.97) 0.0015
Age at first child birth (Ref: 20–25)    0.0185
 14-19 0.33392 1.40 (1.06-1.84) 0.0185
 26-30 −0.21654 0.81 (0.64-1.02) 0.0741
 31-34 −0.28472 0.75 (0.50-1.14) 0.1824
 35-39 −0.32799 0.72 (0.39-1.33) 0.2943
 40-49 −0.68653 0.50 (0.07-3.60) 0.4942
  1. Ref*: Reference level.