| Perinatal period | Perinatal mortality rate |  | |||
---|---|---|---|---|---|---|
Country/region, year, source of data | From: gestational age weeks | To: days survived after birth | Plurality or treatment factor | Published | Computed Australia and New Zealand1,2,3 | P value |
Canada, 2007 | 20 | 28 | Singletons | 12.6 | 12.4 | 0.93 |
Twins | 31.8 | 27.4 | 0.28 | |||
Gunby et al. 2011 | ||||||
HOM4 | 55.6 | 101.2 | 0.18 | |||
Overall | 21.8 | 16.1 | <0.01 | |||
United Kingdom, 1991-2010 | 24 | 28 | Overall | 17.8 | 7.7 | <0.01 |
HFEA, 20115 | ||||||
Sweden, 2002-2006 | 28 | 7 | Singletons | 3.7 | 5.6 | 0.03 |
Sazonova et al. 2011 | ||||||
Japan, 2006 | 22 | 7 | Singletons | 16.3 | 8.3 | <0.01 |
Fujii et al. 2010 | ||||||
Finland, 1995-2006 | 22 | 7 | FET6 singletons | 4.4 | 6.0 | 0.38 |
Pelkonen et al. 2010 | ||||||
Fresh singletons | 5.4 | 6.4 | 0.52 | |||
Latin America, 1990-2009 | 20 | 28 | Singletons | 9.9 | 12.1 | <0.01 |
Twins | 27.8 | 26.2 | 0.41 | |||
Zegers Hochschild et al. 2011 | ||||||
HOM4 | 77.5 | 98.2 | 0.16 | |||
Overall | 23.7 | 15.6 | <0.01 | |||
Norway, 1984-2006 | 22 | 7 | Singletons | 9.5 | 8.3 | 0.27 |
Romundstad et al. 2008 | Â | Â | Â | Â | Â | Â |