The 2008 twin birth rate in the United States was 32.6 per 1,000. That's equal to about 1 in 100 people are a twin
!
- 138,660 twins were born in 2008
- In 2008, the number of higher order multiple deliveries were 6,268, the lowest number in more than a decade. The number of higher order multiple deliveries by type were:
- 5,877 triplets
- 345 quadruplets
- 46 quintuplets or higher
Impact of Fertility Treatments Assisted Reproductive Therapies (including in vitro, ovulation-inducing drugs and artificial insemination) account for 17 percent of all twins and 40 percent of all triplets born in 2007.
- 17 percent of twins are the result of fertility treatments.
- 40 percent of triplets are the result of fertility treatments.
Source: National Vital Statistics Reports, Vol 58. No. 24, August 9, 2010
