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Spearman correlations of third molar agenesis between siblings in dizygotic and monozygotic twins; ANCOVA test(significance of differences dizygotic vs monozygotic twins) statistically significant results: **p < 0.001.
| Variable | tooth 18 | tooth 28 | tooth 38 | tooth 48 |
|---|---|---|---|---|
| Spearman correlations between siblings in dizygotic twins | 0.25 | 0.24 | 0.21 | 0.22 |
| Spearman correlations between siblings in monozygotic twins | 0.57 | 0.55 | 0.79 | 0.80 |
| ANCOVA test | p = 0.000** | p = 0.000** | p = 0.000** | p = 0.000** |
