Table 3.
Twin correlations for the CTRS-R scales rated by the same teacher or different teachers at age 7, 9 and 12
| Oppositional Behavior | Hyperactivity | ADHD index | ||||
|---|---|---|---|---|---|---|
| ST | DT | ST | DT | ST | DT | |
| Age 7 | ||||||
| MZm | 0.772 | 0.495 | 0.842 | 0.479 | 0.820 | 0.555 |
| DZm | 0.360 | 0.280 | 0.347 | 0.289 | 0.437 | 0.292 |
| MZf | 0.617 | 0.394 | 0.749 | 0.492 | 0.770 | 0.514 |
| DZf | 0.404 | 0.233 | 0.310 | 0.211 | 0.342 | 0.217 |
| DOS | 0.294 | 0.112 | 0.301 | 0.176 | 0.339 | 0.250 |
| Age 9 | ||||||
| MZm | 0.763 | 0.334 | 0.790 | 0.465 | 0.792 | 0.447 |
| DZm | 0.405 | 0.211 | 0.342 | 0.208 | 0.353 | 0.296 |
| MZf | 0.635 | 0.442 | 0.712 | 0.407 | 0.793 | 0.497 |
| DZf | 0.498 | 0.081 | 0.302 | 0.145 | 0.379 | 0.270 |
| DOS | 0.244 | 0.133 | 0.296 | 0.242 | 0.327 | 0.254 |
| Age 12 | ||||||
| MZm | 0.719 | 0.518 | 0.792 | 0.434 | 0.818 | 0.546 |
| DZm | 0.350 | 0.282 | 0.297 | 0.310 | 0.283 | 0.301 |
| MZf | 0.606 | 0.500 | 0.681 | 0.361 | 0.751 | 0.414 |
| DZf | 0.338 | 0.297 | 0.315 | 0.282 | 0.276 | 0.245 |
| DOS | 0.232 | 0.185 | 0.234 | 0.205 | 0.265 | 0.233 |
ST same teacher, DT different teacher; MZm monozygotic boys, DZm dizygotic boys, MZf monozygotic girls, DZf dizygotic girls, DOS dizygotic of opposite sex