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Table 1 Distribution of demographic, mammographic screening, and childhood anthropometric data for 13,572 women

From: Birth weight, childhood body mass index, and height in relation to mammographic density and breast cancer: a register-based cohort study

  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   2,765 (20.4) 1,255 (15.3) 1,510 (28.1) 153 (21.4) 2,612 (20.3)
N (%) born 1935-1939   3,484 (25.7) 1,834 (22.4) 1,650 (30.7) 234 (32.7) 3,259 (25.3)
N (%) born 1940-1944   4,035 (29.7) 2,594 (31.7) 1,441 (26.8) 213 (29.7) 3,822 (29.7)
N (%) born 1945-1949   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)   
N (%) with fatty breast   5,378 (39.6) 0 5,378 (100) 175 (24.4) 5,203 (40.5)
N (%) with mixed/dense breast   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)
  1. SD, standard deviation; BMI, body mass index.