Table 1 Characteristics of breast cancer and control subjects at baseline in Brazilian women
Cases (n = 458) | Controls (n = 458) | P* | |||
|---|---|---|---|---|---|
Mean ± SD† | |||||
Age (matching factor), years | 53.2 | ± 10.9 | 53.2 | ± 10.6 | - |
Body mass index, kg/m2 | 26.2 | ± 4.7 | 25.8 | ± 4.2 | 0.207 |
Age at menarche, years | 13.1 | ± 1.8 | 13.1 | ± 1.8 | 0.676 |
Age at the first live birth, years | 24.0 | ± 5.5 | 23.3 | ± 5.4 | 0.082 |
Age at menopause, years | 47.8 | ± 6.0 | 47.6 | ± 5.6 | 0.689 |
Number (%) | |||||
Japanese-Brazilian ethnicity | 79 | (20.8) | 79 | (20.8) | - |
Education to junior college or higher | 112 | (24.5) | 111 | (24.3) | 0.962 |
Former and current smoker | 183 | (40.0) | 145 | (31.7) | 0.009 |
Occasional and regular alcohol consumption | 61 | (13.3) | 100 | (21.8) | 0.001 |
Moderate physical activity in the preceding 5 years | 50 | (10.9) | 79 | (17.3) | 0.006 |
≥ 3 Live births | 199 | (43.5) | 238 | (52.0) | 0.034 |
Breast cancer in first-degree relative | 29 | (6.3) | 27 | (5.9) | 0.783 |
Breast feeding in all women | 353 | (77.1) | 368 | (80.4) | 0.452 |
Postmenopausal women | 274 | (59.8) | 289 | (63.1) | 0.309 |
Vitamin supplement use | 28 | (6.1) | 54 | (11.8) | 0.003 |
Energy-adjusted nutrient intake | Mean ± SD† | ||||
Folate, μg/day | 544.8 | ± 160.2 | 529.4 | ± 154.6 | 0.140 |
Vitamin B6, mg/day | 0.9 | ± 0.6 | 0.9 | ± 0.5 | 0.143 |
Vitamin B12, μg/day | 7.5 | ± 8.7 | 7.0 | ± 5.7 | 0.260 |
Energy, kcal/day | 1815.5 | ± 625.4 | 1722.9 | ± 593.6 | 0.022 |