National Women's Annual Clinical Report 2010

5.3 Multiple pregnancy
This section describes the characteristics and outcomes of mothers who gave birth to
twins and triplets at NW during 2010 and the outcomes of their babies.
Findings
Table 21: Multiple pregnancy rates
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Total
number of
multiple
pregnancies
210 182 172 218 179 208 191 188 187 162 177 160 159 153
Incidence %
Number of
2.4 2.2 2.7 2.3 2.6 2.4 2.4 2.5 2.2 2.3 2.1 2.1 2.0
twin
204 176 166 207 175 201 184 188 184 157 174 156 156 149
pregnancies
Number of
triplet
pregnancies
Number of
quadruplet
pregnancies
6 5 6 11 4 7 7 0 3 5 3 4 3 4
0 1 0 0 0 0 0 0 0 0 0 0 0 0
Table 22: Fetal/neonatal outcomes of multiple pregnancies
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Total number
of babies born
in a multiple
pregnancy
426 371 350 447 362 423 389 376 377 329 357 324 321 310
Incidence %
Number of
multiple
4.8 4.6 5.3 4.7 5.3 4.9 4.9 5.1 4.5 4.5 4.2 4.1 3.9
pregnancies
where one or
more babies
20 12 12 14 26 11 15 13 8 9 12 9 13
died
Incidence %
(no. of
multiple
pregnancies
where a baby
died/number
of multiple
pregnancies)
Number of
babies who
died in a
multiple
pregnancy
Total number
of babies born
in a twin
pregnancy
9.5 6.6 7.0 6.4
30 25 22 23
12.5 5.8 8.0 7.0 4.9 5.1 7.5 5.8 8.5
23 17 12 11 16 13 16
408 352 332 414 350 402 368 376 368 314 348 312 321 298
Twin perinatal
deaths (<
7days)
28 20 22 20 23 16 11 10 13 12 15
Twin perinatal
mortality rate*
68.6 56.8 62.5 48.3
61.2 43.4 35.0 28.7 41.7 37.4 50.3
*Perinatal twin deaths/1000 twin babies born
52