Table 1. Means and proportionsa of baseline characteristics by red meat and white meat quintiles (n=52 158).
| Quintile red meat | Quintile white meat | |||||
|---|---|---|---|---|---|---|
| Characteristic | 1 | 3 | 5 | 1 | 3 | 5 |
| Quintile mean (g per 1000 kcal) | 8.8 | 26.7 | 57.1 | 8.7 | 26.2 | 75.5 |
| Age (years) | 66.0 | 65.3 | 64.5 | 66.1 | 65.3 | 64.4 |
| Race (%) | ||||||
| Non-Hispanic white | 85.1 | 92.6 | 93.9 | 91.0 | 92.3 | 88.7 |
| Non-Hispanic black | 7.0 | 3.1 | 2.2 | 3.7 | 3.1 | 5.6 |
| Hispanic | 1.3 | 1.2 | 1.3 | 1.5 | 1.2 | 1.2 |
| Asian | 5.9 | 2.6 | 1.9 | 3.2 | 2.8 | 3.7 |
| College graduate or postgraduate (%) | 38.8 | 31.4 | 22.9 | 24.2 | 31.4 | 36.7 |
| Family history of breast cancer (%) | 14.1 | 14.1 | 13.6 | 14.1 | 13.8 | 13.7 |
| History of benign breast disease (%) | 28.7 | 28.6 | 26.7 | 26.0 | 28.4 | 30.4 |
| Body mass index (kg m−2) | 25.7 | 27.1 | 28.4 | 26.8 | 27.1 | 27.4 |
| Height (inches) | 64.2 | 64.3 | 64.3 | 64.2 | 64.3 | 64.3 |
| Age at menarche (years) (%) | ||||||
| <10 | 1.5 | 1.3 | 1.8 | 1.3 | 1.5 | 1.7 |
| 10–11 | 18.2 | 18.0 | 19.4 | 17.0 | 18.8 | 20.8 |
| 12–13 | 54.5 | 54.6 | 53.8 | 53.3 | 53.6 | 54.6 |
| 14–15 | 20.8 | 21.8 | 20.3 | 22.8 | 21.7 | 19.0 |
| ⩾16 | 4.8 | 4.2 | 4.5 | 5.5 | 4.2 | 3.9 |
| Oral contraceptive use, ever (%) | 51.9 | 55.7 | 58.8 | 51.6 | 55.6 | 60.0 |
| Age at first birth (years) (%) | ||||||
| <19 | 13.4 | 16.0 | 18.9 | 18.5 | 16.0 | 14.8 |
| 20–24 | 44.0 | 47.9 | 49.9 | 46.7 | 48.1 | 47.1 |
| 25–29 | 23.1 | 20.0 | 17.4 | 18.6 | 20.4 | 21.4 |
| ⩾30 | 8.1 | 7.1 | 5.8 | 6.8 | 6.4 | 7.0 |
| Parity (%) | ||||||
| Nulliparous | 11.1 | 8.6 | 7.7 | 9.1 | 8.8 | 9.3 |
| 1 | 7.9 | 6.7 | 6.7 | 7.3 | 6.3 | 8.0 |
| 2 | 25.5 | 23.6 | 22.9 | 22.0 | 23.9 | 26.2 |
| 3 | 24.4 | 24.6 | 25.9 | 23.6 | 25.6 | 25.6 |
| ⩾4 | 31.0 | 36.3 | 36.7 | 37.9 | 35.3 | 30.9 |
| >1 mammogram in past 3 years (%) | 74.8 | 73.6 | 69.5 | 68.2 | 73.5 | 76.7 |
| Age at menopause (years) (%) | ||||||
| <40 | 13.3 | 13.2 | 14.4 | 14.7 | 13.4 | 13.6 |
| 40–44 | 13.2 | 14.2 | 14.7 | 14.5 | 13.7 | 12.9 |
| 45–49 | 23.7 | 23.5 | 22.8 | 23.6 | 23.4 | 23.2 |
| 50–54 | 38.1 | 36.2 | 36.5 | 35.9 | 37.0 | 38.0 |
| ⩾55 | 11.1 | 12.2 | 11.0 | 10.6 | 11.8 | 11.5 |
| Menopausal hormone therapy (%) | ||||||
| Never | 31.7 | 31.1 | 33.7 | 34.9 | 31.7 | 29.1 |
| <1 year | 11.6 | 11.2 | 10.6 | 11.3 | 11.1 | 11.7 |
| 1–5 years | 19.4 | 19.3 | 18.6 | 17.6 | 18.8 | 20.7 |
| 6–9 years | 12.1 | 13.0 | 12.9 | 10.9 | 13.3 | 14.3 |
| ⩾10 years | 25.1 | 25.4 | 24.2 | 25.3 | 25.2 | 24.3 |
| Smoking (%) | ||||||
| Never | 59.2 | 58.5 | 54.3 | 59.4 | 57.8 | 53.6 |
| Former | 35.4 | 33.7 | 33.8 | 30.1 | 34.4 | 39.0 |
| Current | 5.4 | 7.8 | 11.9 | 10.5 | 7.8 | 7.4 |
| Total caloric intake (kcal per day) | 1476 | 1495 | 1547 | 1491 | 1481 | 1528 |
| Total meat (g per 1000 kcal) | 44.0 | 59.2 | 90.8 | 34.2 | 58.0 | 103.7 |
| Total fat (g per 1000 kcal) | 30.0 | 34.9 | 39.5 | 34.4 | 34.9 | 34.8 |
| Alcohol (g per day) | 4.7 | 5.4 | 4.7 | 4.6 | 5.2 | 5.0 |
a
May not sum to 100% due to missing data or rounding.