TABLE 3.
Association of Material Resources, Education, Body Size, and Breast Cancer Incidence for Postmenopausal White Women: CLUE II, Washington County, MD, 1989–2005
| Model 1 |
Model 2 |
|||
| Full Sample, HR (95% CI) | Subgroup, HR (95% CI) | Full Sample, HR (95% CI) | Subgroup, HR (95% CI) | |
| Material resources, education, and BMI | ||||
| Material resources | 0.95 (0.84, 1.08) | 0.92 (0.78, 1.09) | 0.98 (0.86, 1.12) | 0.94 (0.79, 1.13) |
| Education,a y | 1.06* (1.01, 1.11) | 1.06 (1.00, 1.13) | 1.06* (1.01, 1.11) | 1.06 (0.99, 1.13) |
| BMI,b kg/m2 | 1.03* (1.01, 1.05) | 1.03 (1.00, 1.06) | 1.03* (1.00, 1.05) | 1.03 (1.00, 1.06) |
| Material resources × BMI | 0.98 (0.96, 1.00) | 0.98 (0.95, 1.01) | ||
| Material resources, education, and BMI at age 21 y | ||||
| Material resources | 0.95 (0.84, 1.07) | 0.92 (0.78, 1.09) | 0.95 (0.84, 1.08) | 0.94 (0.78, 1.13) |
| Education, y | 1.05* (1.00, 1.10) | 1.05 (0.99, 1.12) | 1.05* (1.00, 1.10) | 1.05 (0.99, 1.12) |
| BMI at age 21 y, kg/m2c | 0.98 (0.94, 1.02) | 0.99 (0.94, 1.04) | 0.98 (0.94, 1.02) | 0.99 (0.94, 1.04) |
| Material resources × BMI at age 21 yc | 0.99 (0.96, 1.02) | 0.97 (0.93, 1.01) | ||
| Material resources, education, and BMI change | ||||
| Material resources | 0.95 (0.84, 1.08) | 0.92 (0.78, 1.10) | 0.97 (0.85, 1.11) | 0.93 (0.78, 1.10) |
| Education, y | 1.06* (1.01, 1.11) | 1.06 (0.99, 1.13) | 1.06* (1.01, 1.11) | 1.06 (0.99, 1.13) |
| BMI change,d kg/m2 | 1.04* (1.02, 1.07) | 1.04* (1.00, 1.07) | 1.04* (1.02, 1.07) | 1.04* (1.00, 1.07) |
| Material resources × BMI change | 0.99 (0.97, 1.01) | 0.99 (0.95, 1.03) | ||
Note. HR = hazards ratio; CI = confidence interval; BMI = body mass index. We adjusted full group models for age. We adjusted subgroup models for age, hormone use, age at first birth, number of live births, and breastfeeding. Analyses for model 1 included material resources, education, and body size measure; analyses for model 2 included material resources, education, body size measure, and the interaction term.
Mean years of education = 11.7 years.
Mean BMI = 26.2 kg/m2.
Mean BMI at age 21 years = 21.2 kg/m2.
BMI change is the difference between BMI at baseline and BMI at age 21 years.
P < .05, 2 sided.