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Table 1 The summary statistics of duration of gestation and birthweight by maternal/perinatal characteristic in Brisbane, 2000-2010 (n=237,585)

From: Exploring associations of maternal exposure to ambient temperature with duration of gestation and birth weight: a prospective study

Variable (No, %) Duration of gestation, weeks Birth weight, kg
Mean SD Mean SD
Maternal characteristics
 Age at delivery
  <20 (12775, 5.38) 39.06 2.10 3.327 0.578
  20-35 (178029, 74.93) 38.99 1.85 3.429 0.556
  ≥35 (46781, 19.69) 38.88 1.88 3.414 0.569
F/p value 385.95/<.001 198.75/<.001
 Indigenous status
  Indigenous (4650, 1.96) 38.68 2.32 3.295 0.626
  Non-indigenous (232935, 98.04) 38.94 1.86 3.423 0.559
F/p value 92.07/<.001 237.62/<.001
 Marriage
  Married/cohabiting (205243, 86.39) 38.94 1.83 3.432 0.554
  Divorced/separated (28737, 12.10) 38.96 2.13 3.343 0.593
  Never married (3605, 1.52) 38.83 1.93 3.367 0.577
F/p value 8.75/<.001 335.33/<.001
Parity
  Primiparity (99742, 41.98) 39.09 1.96 3.369 0.560
  Multiparity (137843, 58.02) 38.85 1.79 3.457 0.558
F/p value 783.07/<.001 1438.93/<.001
Perinatal characteristics
 Gender
  Male (122374, 51.51) 38.91 1.92 3.480 0.572
  Female (115211, 48.49) 38.97 1.82 3.358 0.541
F/p value 54.67/<.001 2848.04/<.001
 Mode of laboronset
  Spontaneous (132904, 55.94) 39.02 1.89 3.408 0.545
  Induced (55341, 23.29) 39.50 1.62 3.523 0.537
  Caesarean (49340, 20.77) 38.06 1.78 3.338 0.608
F/p value 8651.48/<.001 1501.11/<.001
 Duration of gestation at birth, wk
  ≥39 (160888, 67.72) 39.85 0.77 3.574 0.449
  37-39 (61650, 25.95) 37.77 0.42 3.272 0.461
  34-37 (11097, 4.67) 35.36 0.76 2.675 0.472
  <34 (3950, 1.66) 29.98 2.38 1.554 0.614
F/p value 40154.50/<.001 40154.50/<.001
 Birth weight for gestation
  SGA (23161, 9.75) 38.53 2.46 2.654 0.408
  AGA (214424, 90.25) 38.98 1.79 3.503 0.510
F/p value 1225.05/<.001 60148.60/<.001
  1. Abbreviations: SGA small for gestational age, AGA appropriate for duration of gestation