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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