Table 1a:
Number of Complete and Incomplete Twin Pairs, by Sex and Zygosity
| Girls | Boys | |||
|---|---|---|---|---|
|
| ||||
| Monozygotic | Dizygotic | Monozygotic | Dizygotic | |
| Complete pairs, number | 225 | 164 | 208 | 149 |
| Incomplete pairs, number | 3 | 10 | 13 | 8 |
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