Table 4

Matched case–control analysis for breast cancer incidence with classification on minor sector of longest duration, and reproductive and demographic risk factors: full model, by conditional logistic regression
Parameter Estimate Chi-Sq Wald P OR (95% CI)
Ind: never pregnant −0.078 0.23 0.64 0.93 (0.67-1.28)
Number of full-term pregnancies −0.054 4.05 0.044 0.95 (0.90-1.00)
Duration fecundity, year 0.025 14.94 0.0001 1.03 (1.01-1.04)
Total breastfeeding, mo −0.004 0.93 0.33 1.00 (0.99-1.00)
Ind: education < high-school 0.387 7.34 0.0067 1.47 (1.11-1.95)
Ind: education > high-school and some college −0.099 0.81 0.37 0.91 (0.73-1.12)
Ind: family income >= $40,000 and bluecollar −0.559 15.98 <.0001 0.57 (0.44-0.75)
Ind: family income >= $40,000 and whitecollar −0.464 15.90 <.0001 0.63 (0.50-0.79)
Pack-years of smoking (lagged 5 year) 0.019 4.54 0.033 1.02 (1.00-1.04)
Pack-years of smoking, squared −3.3 10-4 3.00 0.083 1.00 (1.00-1.00)
Minor sector of longest duration (lagged 5 year)
Agriculture/plants 0.219 0.39 0.53 1.25 (0.63-2.47)
Agriculture/animals 0.696 0.79 0.37 2.01 (0.43-9.28)
Mining −1.782 0.30 0.59 0.17 (0.00-102.)
Power Generation/distribution 0.435 0.37 0.54 1.55 (0.38-6.31)
Construction 0.245 0.15 0.70 1.28 (0.37-4.46)
Food manufacturing 0.812 3.53 0.060 2.25 (0.97-5.26)
Liquor/beer/wine −0.849 2.29 0.13 0.43 (0.14-1.29)
Tobacco manufacturing −0.984 0.44 0.51 0.37 (0.02-6.83)
Textile manufacturing 0.549 0.49 0.48 1.73 (0.37-8.04)
Wood manufacturing −0.109 0.01 0.92 0.90 (0.11-7.05)
Printing −0.307 0.26 0.61 0.74 (0.23-2.40)
Petroleum, petrochemical, chemical mfr −0.294 0.24 0.63 0.75 (0.23-2.43)
Plastics manufacturing (non-auto) −3.211 0.75 0.39 0.04 (0.00-58.0)
Plastics manufacturing (auto) 1.137 6.34 0.012 3.12 (1.29-7.55)
Glass, ceramic manufacturing −0.895 0.47 0.49 0.41 (0.03-5.24)
Metallurgical, metalworking and fabrication 0.118 0.18 0.67 1.13 (0.65-1.94)
Electrical and electronics manufacturing −0.357 0.06 0.81 0.70 (0.04-12.3)
Jewelry, furniture manufacturing −2.141 2.86 0.091 0.12 (0.01-1.41)
Retail −0.470 3.60 0.058 0.63 (0.39-1.02)
Transportation −0.258 0.58 0.45 0.77 (0.40-1.50)
Media, culture −0.688 3.05 0.081 0.50 (0.23-1.09)
Administration (non educ, non healthcare) 0.000 0.00 0.99 1.00 (0.62-1.61)
Education 0.032 0.02 0.90 1.03 (0.62-1.71)
Healthcare −0.104 0.18 0.67 0.90 (0.56-1.46)
Entertainment −0.943 2.51 0.11 0.39 (0.12-1.25)
Hotels and motels −0.090 0.02 0.89 0.91 (0.26-3.19)
Beauty salon/hair care −0.491 1.45 0.23 0.61 (0.28-1.36)
Drycleaning, laundry 1.000 1.54 0.21 2.72 (0.56-13.2)
Bars, gaming/gambling 0.582 1.59 0.21 1.79 (0.73-4.41)

OR – odds ratio, 95% CI – 95% confidence interval, Ind – (0,1) indicator variable.

Matching on age in 3 year- intervals.

Reference category: minor sector = Restaurants, food services / age = 40 / Education = high-school or some college / blue collar / Family annual income < $40,000 / Ever-pregnant, zero births / non smoker.

Brophy et al.

Brophy et al. Environmental Health 2012 11:87   doi:10.1186/1476-069X-11-87

Open Data