TABLE 1.
Year | Total number of recorded births | Estimated number of twin pairs φ | Number of complete twin pairs recruited |
---|---|---|---|
1961 | 8982 | 157 | 13 |
1988 | 6779 | 119 | 75 |
1989 | 6813 | 119 | 56 |
1990 | 7043 | 123 | 52 |
1991 | 6870 | 120 | 82 |
1992 | 6987 | 122 | 34 |
Calculations assume a twin birth rate of 3.5% of all live births (Australian Twin Registry)