Gestational Age No. of Survival No. of Admission Survival Rate 20weeks 0/4 [0/0] 0% [0/0] 21weeks 0/8 [0/0] 0% [0/0] 22weeks 44/241 [51/164] 18% [ 31%] 23weeks 242/568 [234/416] 43% [ 56%]

Table 3: Survival rates of infants less than 24 weeks of gestation (born between 1995-2001 at 112 hospitals of Japan neonatologists network) [repeated study born between 2002-2004].