From: Very advanced maternal age and morbidity in Victoria, Australia: a population based study
 | 30–34 yrs | 45+ yrs |  | ||||
---|---|---|---|---|---|---|---|
n | % | n | % | OR | 95% CI | P value | |
Gestation | Â | Â | Â | Â | Â | Â | Â |
< 31 weeks’ | 655 | 1.4% | 5 | 2.2% | 1.84 | (0.7, 4.6) | 0.2065 |
32–36 weeks’ | 3041 | 6.1% | 33 | 14.3% | 2.61 | (1.8, 3.8) | <0.001 |
Birth-weight | Â | Â | Â | Â | Â | Â | Â |
<2,500Â g | 3042 | 6.1% | 29 | 12.6% | 2.22 | (1.5, 3.3) | <0.001 |
> = 4,500 g | 948 | 1.9% | <5 | 1.7% | 0.98 | (0.3, 2.7) | 1 |
Small for gestational age | 3861 | 7.7% | 26 | 11.3% | 1.53 | (1.0, 2.3) | 0.0404 |
Perinatal death | Â | 6.9/1000 births | Â | 13.0/1000 births | Â | Â | Â |