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Gender dysphoria (GD) in twin and non-twin siblings to probands of same or different assigned sex.
| GD in both siblings (N, %) | GD only in proband (N, %) | p-value (derived from Fisher’s exact test) | |
|---|---|---|---|
| Different-sex twins (N = 27) | 10 (37.0%) | 17 (63.0%) | < 0.001 |
| Same-sex twins (N = 40) | 0 (0%) | 40 (100.0%) | |
| Different-sex siblings (N = 1223) | 2 (0.2%) | 1221 (99.8%) | 1 |
| Same-sex siblings (N = 1311) | 2 (0.2%) | 1309 (99.8%) |
