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Table 1 Maternal and child characteristics in the Northern Sweden Maternity Cohort

From: Early pregnancy sex steroids during primiparous pregnancies and maternal breast cancer: a nested case–control study in the Northern Sweden Maternity Cohort

Characteristic Cases (n = 223) Controls (n = 417)
Age at blood collection (years) 26.5 (17–39) 26.5 (17–39)
Gestational age at blood collection (days) 72 (36–116) 70 (37–120)
Children at diagnosis/selection as control
 1 55 (25%) 78 (19%)
 2 120 (54%) 209 (50%)
 3 48 (22%) 130 (31%)
Number of pregnancies at blood collectiona
 1 182 (82%) 327 (78%)
 2 35 (16%) 75 (18%)
 3 6 (3%) 15 (4%)
Maternal weightb (kg) 61 (39–89) 60 (37–127)
Maternal heightc (cm) 165 (147–183) 165 (144–180)
Current smoker 73 (33%) 121 (29%)
Child weight (g) 3470 (2300–4680) 3450 (2115–4770)
Case characteristics
 Age at diagnosis (years) 46.7 (25.5–63.8)  
 Lag-time (years) 19.8 (2.7–30.5)
Tumor characteristics
 ER status
  Positive 171 (77%)  
  Negative 52 (23%)
 PR status
  Positive 157 (70%)  
  Negative 66 (30%)
 AR statusd
  Positive 77 (84%)  
  Negative 15 (16%)
  1. Data presented as median (range) or n (%)
  2. AR androgen receptor, ER estrogen receptor, PR progesterone receptor
  3. aNumber of pregnancies includes induced and spontaneous abortions
  4. bMaternal weight missing for four cases
  5. cMaternal height missing for 10 cases and 19 controls
  6. dAR status available for 41% of cases