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Kidney stones among twins by zygosity and sex in the Washington State Twin Registry
| MZ men | DZ men | MZ women | DZ women | |
|---|---|---|---|---|
| Total pairs | 1684 | 841 | 3069 | 1459 |
| Concordant for stones, n pairs | 40 | 12 | 29 | 9 |
| Discordant for stones, n pairs | 123 | 86 | 231 | 140 |
| Tetrachoric correlation | 0.68 | 0.41 | 0.43 | 0.21 |
DZ, dizygotic; MZ, monozygotic.
