Have gestational diabetes. In 2000, the incidence was 69.5 per
1,000 for women over 40 compared to 8.8 per 1,000 for women
under 20. The average incidence was 29.3 per 1,000 women. Have
pregnancy-associated hypertension. In 2000, the incidence ranged
from 40 to 48 per 1,000 for women over 40. The average incidence
was 38.8 per 1,000 women. Give birth to a low birth weight baby,
defined as less than 2,500 grams. Much of this risk results from
the frequent multiple births among older women. In 2000, 55
percent of low birth-weight babies born to women over 45 were
born in multiple deliveries. If only singleton births are
considered, women over 45 were substantially less likely to have
a low birth-weight baby than the youngest women. In 2000, 19.4
per 1,000 women age 30 to 34 had the procedure, while 95.9 per
1,000 women age 35 to 39 opted for it. Miscarriage rates for
women in their 30s increase by about 50 percent over women in
their 20s and increase twofold to fourfold for women in their
40s. Almost half of al