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Table 3 Descriptive statistics for breast cancer cases and controls

From: Breast cancer risk in relation to occupations with exposure to carcinogens and endocrine disruptors: a Canadian case–control study

  Controls Cases
n 1146 1006
Age @ interview, years, mean 56.2 60.0
Year @ interview (controls),or diagnosis (cases), mean 2006.3 2005.8
Never pregnant, % 11.9 11.9
Number of full-term pregnancies, mean 2.83 2.84
Duration fecundity, year, mean 32.2 33.9
Total breastfeeding, mo, mean 5.8 4.9
Education < HS, % 13.3 23.6
Education = HS or some college, % 40.1 38.7
Education > HS and some college, % 46.6 37.7
Family annual income < $40,000, % 31.3 46.8
Family income >= $40,000 and bluecollar, % 22.5 17.5
Family income >= $40,000 and whitecollar, % 46.2 35.7
Pack-years of smoking (lagged 5 year), mean 6.39 7.52
Duration employed (lagged 5 year), year, mean 25.7 25.5
Cumulative exposure in Major Sectors 1   
Farming, mean 7.19 12.06
Non-plastic light mfg, mean 1.21 1.39
Petrochemical, mean 0.12 0.12
Plastics mfg, mean 1.99 4.13
Metalworking, mean 2.33 4.50
Transportation, mean 0.88 0.71
Beauty care, laundry/dry cleaning, mean 0.39 0.39
Bars-gambling, mean 0.11 0.17
  1. 1 cumulative exposure on transformed ratings: 1 (low), 2 (moderate), 3 (high) → 0, 1, 10, as rating-year.