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Table 1 Baseline characteristics of cohort members, follow-up of 22,931 women

From: The association of women’s birth size with risk of molecular breast cancer subtypes: a cohort study

  Number (%)
Mother’s age at birth, mean (SD) 28.0 (6.1)
Birth weight, g
 Mean (SD) 3446 (508)
  < 3000 g 3684 (16.1)
 3000–3499 g 8657 (37.8)
 3500–3999 g 7672 (33.5)
  ≥ 4000 g 2912 (12.7)
 Missing 6 (0.03)
Birth length, cm
 Mean (SD) 50.5 (2.1)
  < 49 3190 (13.9)
 49 3055 (13.3)
 50 5298 (23.1)
 51 4317 (18.8)
  ≥ 52 7066 (30.8)
 Missing 5 (0.02)
Head circumference, cm
 Mean (SD) 34.8 (1.5)
  < 34 3849 (16.8)
 34 5397 (23.5)
 35 6408 (27.9)
 36 4642 (20.2)
  ≥ 37 2549 (11.1)
 Missing 86 (0.4)
Total 22,931 (100)