Table 3.
Descriptive statistics for breast cancer cases and controls
| 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 Sectors1 |
|
|
| 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 cumulative exposure on transformed ratings: 1 (low), 2 (moderate), 3 (high) → 0, 1, 10, as rating-year.