Years Concordant Discordant Concordance  rate FD-FD FD-Inf  Inf-Inf Total FD(TTTS) Inf(TTTS) Total Total MM FF UU MM FF MM FF MM* FF* UU* MM* FF* MM FF Total 1995-1998 51 44 10 9 6 4 3 127 40 34 6 39 35 154 0.45 0.43 0.45 1999-2003 95 70 17 3 10 7 10 212 61 78 8 47 55 249 0.49 0.40 0.46 2004-2008 66 49 12 3 3 5 7 145 60 52 33 39 31 215 0.43 0.42 0.40 Total 212 163 39 15 19 16 20 484 161 164 47 125 121 618 0.46 0.41 0.44 Note: FD=fetal death, Inf=infant death, M*=unaffected male, F*=unaffected female, U*=unaffected unknown sex

Table 4: Concordance rate of TTTS according to survival states and sex, 1995-2008.

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