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Table 4 Comparison of international perinatal mortality definitions and rates as applied to Australia and New Zealand 1

From: Perinatal mortality following assisted reproductive technology treatment in Australia and New Zealand, a public health approach for international reporting of perinatal mortality

 

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

      
  1. 1Calculated from ANZARD data, 2004-2008.
  2. 2Calculated using the same time period for the years of data 2004–2008; if the data includes the 5 years of data plus additional data only 2004-2008 Australian and New Zealand data used.
  3. 3Differences in the computed Australian and New Zealand rates reflect the different time periods.
  4. 4HOM higher order multiple excludes twins.
  5. 5Calculated from publically available HFEA data.
  6. 6FET frozen embryo transfer.