Table 3 Monozygotic and dizygotic ART and non-ART twins, Australia, 2007–2011
Non-ART | ART | |||
|---|---|---|---|---|
No. | % | No. | % | |
Opposite-sex twins | 4300 | 28.6 | 2048 | 44.8 |
Same-sex twins | 10,756 | 71.4 | 2526 | 55.2 |
Weinberg’s differential rule | ||||
Dizygotic twins | 8600 | 4096 | ||
Monozygotic twins | 6456 | 478 | ||
All births where sex is available | 582,475 | 24,071 | ||
Twins where sex is available | 15,056 | 4574 | ||
Dizygotic twin rate | 1.5 | 17.0 | ||
Monozygotic rate | 1.1 | 2.0 | ||