Ville et al. 1998 n=132 Hecher et al. 1999 n=73 Hecher et al. 2000 n=200 Quintero et al. 2003 n=95 Senat et al. 2004 n=72 Huber et al. 2006 n=200 Middledorp et al. 2007 n=100 Cincotta et al. 2009 n=100 Chmait et al. 2011 n=682 Present study 2012 n=171 Median gestational age at delivery (weeks) - 33 34 32 33 34 33 31 33 33 Perinatal survival (%) 55 61 - 64 56 72 70 76 79 78 Neurological sequels (%) 4 6 6 4 7 - - 3   5 2 survivors (%) 36 42 50 44 36 60 58 66 72 64 1 survivor (%) 38 37 30 38 38 24 23 19 18 29 0 survivor (%) 26 21 20 17 26 17 19 15 10 7 At least 1 survivor 74 79 80 82 74 84 81 85 90 93

Table 4: Comparison of perinatal outcomes in published series.