Year Number of triplet sets Triplet rate1 MMM MMF MFF FFF UK Total sexed Like sexed Unlike Total 1999 56 112 107 56 10 341 93.2 182.3 283.8 2000 61 106 106 48 7 328 89.6 174.3 269.7 2001 63 83 90 46 11 293 91.2 144.7 245.1 2002 50 109 104 42 14 319 78.1 180.9 270.9 2003 61 82 68 51 24 286 97.8 130.9 249.7 2004 57 99 86 52 13 307 96.3 163.5 271.3 2005 43 63 80 40 20 246 76.8 132.2 227.5 2006 46 63 73 48 16 246 84.7 122.2 221.5 2007 35 61 65 48 10 219 75.0 113.9 198.0 2008 25 57 46 41 12 181 59.6 93.0 163.4 1 per million deliveries

Table1: Triplet Rate according to Like- and Unlike-sexed Triplets, 1999-2008.

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