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Table 4 Characteristics of the study cohort: Lifestyle and health behaviours

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

Variable n = 89434(%)
Lifestyle and health behaviours  
Practice BSE  
 Yes 44802 (50.10)
 No 44632 (49.90)
Ever used oral contraceptives  
 Yes 53694 (60.04)
 No 35740 (39.96)
Length of oral contraceptive used (months) (mean±SD) 32.70(±46.98)
Ever used estrogen, w/wo progesterone  
 Yes 24489 (27.38)
 No 64945 (72.62)
Length of estrogens/progesterone used (months) (mean±SD) 13.11(±35.67)
Ever smoked  
 Yes 45091 (50.42)
 No 44343 (49.58)
Cigarettes per day  
 0 per day 44343 (49.58)
 Occasionally 1907 (2.13)
 1-5 per day 6981 (7.81)
 6-10 per day 9023 (10.09)
 11-25 per day 21963 (24.56)
 26-50 per day 4939 (5.52)
 >50 per day 278 (0.31)
Ever had a mammogram  
 Yes 24429 (27.32)
 No 65005 (72.68)
Number of mammograms  
 0 65088 (72.78)
 1 16324 (18.25)
 2-3 6610 (7.39)
 >4 1412 (1.58)