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Estimates of the Within Twin Pair Tetrachoric Correlations Under the Conditions of Same Prevalence for Twins in a Twin Pair and for Monozygotic and Dizygotic Twins
| Zygosity | Number of Twin Pairs | Tetrachoric Correlation | 95% CI |
|---|---|---|---|
| All | 617 | −0.01 | −.15 to .13 |
| Monozygotic | 112 | 0.21 | −.10 to .50 |
| Dizygotic | 505 | −0.07 | −.23 to .09 |
| Monozygotic | 112 | 0.21 | −.10 to .50 |
| SS Dizygotic | 262 | −0.10 | −.30 to .11 |
| OS Dizygotic | 243 | −0.03 | −.28 to .22 |
Abbreviations: OS, opposite sex; SS, same sex.
