To estimate triplet rates for like-sexed and unlike-sexed sets, and infant mortality rate (IMR), and also to find risk factors for IMR in triplets. Study design: These rates were estimated using Japanese Vital Statistics from 1999 to 2008. Results: Like-sexed and unlike-sexed triplet rates decreased significantly from 1999 to 2008. In 1999, the rate was 2.0-fold higher in unlike-sexed triplets than in like-sexed ones, but the difference decreased to 1.6 fold in 2008.
Citation: Imaizumi Y, Hayakawa K (2013) The End of a Triplet Epidemic and Infant Mortality in Japan, 1999-2008. Gynecol Obstet 3:139. doi: 10.4172/2161- 0932.1000139