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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.