Table 2. The description of duration of gestation and birth weight by different ambient temperature category in Brisbane, 2000-2010 (n=237,585)
| Â | 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 | ||