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Table 2. The description of duration of gestation and birth weight by different ambient temperature category 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

  Duration of gestation, weeks Birth weight, kg
Mean SD Mean SD
In the first week
 Maximum temperature
  >30 38.93 1.87 3.423 0.561
  25-30 38.94 1.84 3.424 0.558
  20-25 38.94 1.91 3.414 0.564
  ≤20 38.96 1.85 3.424 0.555
F/p value 1.28/0.298 6.31/<.001
 Minimum temperature
  >20 38.95 1.82 3.430 0.555
  15-20 38.92 1.86 3.420 0.560
  10-15 38.93 1.90 3.414 0.563
  ≤10 38.96 1.92 3.420 0.565
F/p value 3.78/0.010 7.78/<.001
In the first four weeks
 Maximum temperature
  >30 38.92 1.83 3.425 0.558
  25-30 38.94 1.85 3.423 0.558
  20-25 38.94 1.92 3.415 0.565
  ≤20 38.98 1.80 3.425 0.540
F/p value 0.72/0.539 3.85/0.009
 Minimum temperature
  >20 38.96 1.82 3.431 0.556
  15-20 38.92 1.85 3.419 0.558
  10-15 38.92 1.92 3.417 0.566
  ≤10 38.98 1.87 3.421 0.558
F/p value 9.47/<.001 10.53/<.001
In the last week
 Maximum temperature
  >30 38.93 1.89 3.407 0.565
  25-30 38.95 1.88 3.421 0.561
  20-25 38.93 1.85 3.422 0.558
  ≤20 38.93 1.88 3.431 0.563
F/p value 1.23/0.298 6.31/<.001
 Minimum temperature
  >20 38.92 1.91 3.411 0.564
  15-20 38.95 1.88 3.422 0.562
  10-15 38.94 1.84 3.423 0.557
  ≤10 38.93 1.85 3.426 0.559
F/p value 3.68/0.0112 6.28/<.001
In the last four weeks
 Maximum temperature
  >30 38.95 1.87 3.411 0.562
  25-30 38.94 1.89 3.419 0.561
  20-25 38.93 1.84 3.425 0.559
  ≤20 38.92 1.99 3.425 0.566
F/p value 0.84/0.472 4.58/0.003
 Minimum temperature
  >20 38.93 1.89 3.407 0.562
  15-20 38.95 1.88 3.417 0.560
  10-15 38.93 1.85 3.424 0.559
  ≤10 38.93 1.86 3.424 0.563
F/p value 3.38/0.017 6.78/<.001