Table 1.
Distribution of selected characteristics by octiles of trunk fat mass
| Octiles of trunk fat mass | P‐value | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||
| Age (years), mean | 63.2 | 63.7 | 63.9 | 63.7 | 64.2 | 63.4 | 62.7 | 61.2 | <.001 |
| Family history of breast cancer (%) | 16.8 | 14.8 | 16.8 | 16.4 | 16.8 | 16.3 | 15.2 | 15.8 | .737 |
| Age at menarche (% <12 y) | 16.1 | 15.5 | 20.1 | 20.5 | 21.1 | 22.0 | 25.3 | 27.8 | <.001 |
| Age at first full‐term pregnancy (% ≥30 y) | 7.5 | 6.1 | 7.1 | 5.5 | 5.6 | 5.3 | 6.3 | 6.1 | <.001 |
| Parity (% Nulliparous) | 12.5 | 11.6 | 12.2 | 11.6 | 8.9 | 9.2 | 10.0 | 10.4 | <.001 |
| Age at menopause (% ≥55 y) | 8.6 | 9.1 | 6.7 | 7.8 | 6.9 | 7.2 | 7.7 | 6.3 | <.001 |
| Body mass index (kg/m2), mean | 21.4 | 23.6 | 25.2 | 26.6 | 28.2 | 30.0 | 32.7 | 38.0 | <.001 |
| Waist circumference (cm), mean | 69.2 | 74.6 | 78.8 | 82.6 | 86.4 | 90.8 | 96.8 | 107.0 | <.001 |
| Waist to hip ratio, mean | 0.74 | 0.77 | 0.79 | 0.80 | 0.82 | 0.83 | 0.84 | 0.85 | <.001 |
| Oral contraceptive use (%) | 38.6 | 37.2 | 36.4 | 36.1 | 36.7 | 36.6 | 37.0 | 39.4 | .595 |
| HT use (%) | 57.8 | 60.4 | 57.0 | 53.9 | 54.3 | 47.8 | 49.1 | 43.5 | <.001 |
| Alcohol consumption (servings/week), mean | 2.3 | 2.1 | 2.1 | 1.8 | 1.8 | 1.4 | 1.2 | 1.0 | <.001 |
| Physical activity (MET‐hours/week), mean | 16.6 | 13.1 | 11.2 | 10.9 | 9.5 | 7.9 | 7.1 | 5.7 | <.001 |
| Smoking (never; %) | 52.5 | 56.2 | 53.3 | 55.6 | 55.9 | 56.6 | 56.1 | 53.3 | .106 |
| Education (% post‐college) | 31.2 | 25.6 | 22.6 | 20.7 | 20.1 | 19.6 | 19.5 | 17.1 | <.001 |
| Race/ethnicity (%) | |||||||||
| Non‐Hispanic white | 88.4 | 84.1 | 80.2 | 79.5 | 78.2 | 75.0 | 70.0 | 67.5 | <.001 |
| Black | 6.2 | 9.1 | 11.6 | 12.4 | 13.3 | 14.8 | 20.2 | 23.4 | |
| Hispanic | 3.4 | 5.0 | 6.7 | 6.5 | 6.8 | 8.0 | 6.8 | 6.4 | |
| Other | 2.0 | 1.8 | 1.5 | 1.6 | 1.7 | 2.3 | 3.0 | 2.7 | |