How common are they? defects, by cted maternal and infant characteristics and maternal race/- Metropolitan Atlanta Congenital Defects Program(MACDP), 1978-2005T Birth Defects Surveillance and Research-ICBDSR 46 Members in 38 Countries, 4. 5 ml births/year Britisn Columbs 41000 120000Q 198019831986199 1921m92m1 0032005 Birth years deformation t New Zealand adverse effect 5n00 f2005 data are preliminary. Mantel-Haenszel test for trend, p=0.19 Numbers mean births per ye In the Us/world, N% babies born with a birth defect http://www.cdc.govHow common are they? In the US/world, ~3% babies born with a birth defect http://www.cdc .gov/