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Annual Trend in Zygotic Twinning Rates and their Association with Maternal Age in Japan, 1999-2008
Gynecology & Obstetrics
Objective: We aimed to determine the recent trend in monozygotic (MZ) and dizygotic (DZ) twinning rates and their association with maternal age (MA). Study design: The MZ and DZ twinning rates were estimated using Japanese vital statistics from 1999 to 2008. Results: The DZ twinning rate per 1000 deliveries increased from 5.10 in 1999 to 7.66 in 2005 and decreased thereafter (5.98 in 2008). The MZ twinning rate increased significantly with an increase in MA in 2002MA in , 2003MA in , 2006MA indoi:10.4172/2161-0932.1000189 fatcat:vea4ap25p5hrro7du52bg6knjy