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Table 2 Characteristics of the study cohort: Socio-demographic factors

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

Variable n = 89434(%)
Age at entry (mean±SD) 48.51(±5.61)
Birth place  
 Canada 73611 (82.31)
 Foreign 15823 (17.69)
Years in Canada  
Born in Canada 73538 (82.22)
 1-5 516 (0.58)
 6-10 955 (1.07)
 11-20 4567 (5.11)
 > 20 9858 (11.02)
Mother's birth place  
 Canada 59103 (66.09)
 Foreign 30331 (33.91)
Father's birth place  
 Canada 56169 (62.80)
 Foreign 33265 (37.20)
Ethnic origin  
 Canada 336 (0.38)
 Foreign 89098 (99.62)
Marital status  
 Ever Married 84046 (93.98)
 Never Married 5388 (6.02)
Occupations  
 Homemakers 31186 (34.86)
 Clerical Occupations 18922 (21.16)
 Social sciences, religion, teaching, artistic, literary and related 9808 (10.97)
 Medicine and health 8405 (9.40)
 Administrative and Managerial 6026 (6.74)
 Sales Occupations 4836 (5.41)
 Service Occupations-food and personal service 3460 (3.87)
 Processing, machining, fabricating, and construction occupations 1187 (1.33)
 Natural sciences, engineering and math 684 (0.76)
 Transport, material handling, equipment operating 622 (0.70)
 Farming, forestry and fishing 567 (0.63)
 Others 3731 (4.17)
Allocation group  
 No mammography 44744 (50.03)
 Mammography 44690 (49.97)