From the MMWR:
The rate of triplet and other higher-order multiple births increased substantially, from 37 per 100,000 live births in 1980 to 194 in 1998, a trend largely attributable to increased usage of fertility therapies. During 1999--2003, the rate of triplet and higher-order multiple births has remained stable. Older mothers and non-Hispanic white mothers are the most likely to have a triplet or higher-order multiple birth.Technorati Tags: Pregnancy, Multiple Births, Fertility Treatment