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MZ and DZ twin polychoric correlations (and standard errors) for each phenotype
| phenotype | MZ twin corr. (se) | DZ twin corr.(se) |
|---|---|---|
| 1) Any probable tic | .37 (0.05) | .18 (0.07) |
| 2) Probable TS/probable chronic tic disorder | .24 (0.21) | .15 (0.21) |
| 3) Probable TS/probable chronic motor tic disorder. | .32 (0.21) | .19 (0.21) |
| 4) Three levels (no tics vs. probable transient/NOS tic disorder. vs. TS/probable chronic tic disorder | .37 (0.06) | .17 (0.07) |
