Table 1 Distribution of demographic, mammographic screening, and childhood anthropometric data for 13,572 women
|  | Number of subjects | Total N = 13,572 | Mammographic density | Breast cancer | ||
|---|---|---|---|---|---|---|
|  |  |  | Mixed/dense breasts n = 8,194 | Fatty breasts n = 5,378 | Breast cancer casesn = 716 | No breast cancer n = 12,856 |
N (%) born 1930-1934 | Â | 2,765 (20.4) | 1,255 (15.3) | 1,510 (28.1) | 153 (21.4) | 2,612 (20.3) |
N (%) born 1935-1939 | Â | 3,484 (25.7) | 1,834 (22.4) | 1,650 (30.7) | 234 (32.7) | 3,259 (25.3) |
N (%) born 1940-1944 | Â | 4,035 (29.7) | 2,594 (31.7) | 1,441 (26.8) | 213 (29.7) | 3,822 (29.7) |
N (%) born 1945-1949 | Â | 3,288 (24.2) | 2,511 (30.6) | 777 (14.4) | 116 (16.2) | 3,172 (24.7) |
Mean (SD) age at screening (years) | 13,572 | 54.6 (3.4) | 54.1 (3.1) | 55.3 (3.5) | Â | Â |
N (%) with fatty breast | Â | 5,378 (39.6) | 0 | 5,378 (100) | 175 (24.4) | 5,203 (40.5) |
N (%) with mixed/dense breast | Â | 8,194 (60.4) | 8,194 (100) | 0 | 541 (75.5) | 7,653 (59.5) |
Mean (SD) birth weight (g) | 8.271 | 3,330 (543) | 3,324 (538) | 3,340 (554) | 3,302 (554) | 3,331 (543) |
Mean (SD) BMI at age 7 (kg/m2) | 12.640 | 15.4 (1.3) | 15.2 (1.2) | 15.6 (1.5) | 15.2 (1.3) | 15.4 (1.3) |
Mean (SD) BMI at age 8 (kg/m2) | 12.887 | 15.8 (1.5) | 15.6 (1.4) | 16.0 (1.6) | 15.7 (1.3) | 15.8 (1.5) |
Mean (SD) BMI at age 9 (kg/m2) | 12.968 | 16.2 (1.6) | 16.0 (1.5) | 16.5 (1.7) | 16.1 (1.5) | 16.2 (1.6) |
Mean (SD) BMI at age 10 (kg/m2) | 13.014 | 16.7 (1.8) | 16.4 (1.6) | 17.1 (2.0) | 16.5 (1.7) | 16.7 (1.8) |
Mean (SD) BMI at age 11 (kg/m2) | 13.045 | 17.1 (2.0) | 16.8 (1.8) | 17.6 (2.1) | 17.0 (1.9) | 17.1 (2.0) |
Mean (SD) BMI at age 12 (kg/m2) | 13.050 | 17.8 (2.1) | 17.4 (1.9) | 18.3 (2.3) | 17.6 (2.0) | 17.8 (2.1) |
Mean (SD) BMI at age 13 (kg/m2) | 13.002 | 18.6 (2.3) | 18.2 (2.1) | 19.3 (2.5) | 18.5 (2.1) | 18.6 (2.3) |
Mean (SD) Height at age 7 (cm) | 12.636 | 120.2 (5.4) | 120.3 (5.4) | 119.9 (5.4) | 120.3 (5.4) | 120.2 (5.4) |
Mean (SD) Height at age 8 (cm) | 12.882 | 125.3 (5.7) | 125.4 (5.6) | 125.1 (5.7) | 125.4 (5.5) | 125.3 (5.7) |
Mean (SD) Height at age 9 (cm) | 12.963 | 130.4 (5.9) | 130.5 (5.9) | 130.2 (5.9) | 130.6 (5.7) | 130.3 (5.9) |
Mean (SD) Height at age 10 (cm) | 13.011 | 135.4 (6.2) | 135.5 (6.2) | 135.3 (6.2) | 135.7 (6.0) | 135.4 (6.2) |
Mean (SD) Height at age 11 (cm) | 13.039 | 140.8 (6.7) | 140.9 (6.7) | 140.7 (6.7) | 141.1 (6.6) | 140.8 (6.7) |
Mean (SD) Height at age 12 (cm) | 13.044 | 146.9 (7.4) | 146.9 (7.4) | 146.8 (7.4) | 147.4 (7.3) | 146.9 (7.4) |
Mean (SD) Height at age 13 (cm) | 12.991 | 153.1 (7.4) | 153.2 (7.4) | 152.8 (7.4) | 153.5 (7.2) | 153.1 (7.4) |