UK outcomes 2016 IVF IUI 4051 490 12.1 35 7.1 6 1.2 Total Total Births Birth/cycle % Twin births % Twins Triplets % Triplets 6I8U09I9 18602 27.3 1996 13.7 31 0.25 Multiple birth rates, IVF vs IUI Twins Triplets Total IVF IUI 17.5% 9.5% 0.5% 0.6% 18% 10.1% ESHRE, Hum Reprod, 2017 116 113