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Main demographic and clinical features of the 7 pairs of MZ twins discordant for Pso or PsA.
| Pso/PsA affected MZ co-twins (n = 7) | Non-affected MZ co-twins (n = 7) | |
|---|---|---|
| Median age, years (range) | 44 (25–68) | 44 (25–68) |
| Female/male | 1/6 | 1/6 |
| Pso only | 4 | — |
| PsA only | 2 | — |
| Pso + PsA | 1 | — |
| Family history for psoriatic disease | 4 | 4 |
| Current smoker | 2 | 2 |
| Former smoker | 1 | 2 |
| Years of co-living (average) | 25 | 25 |
