Table 2.
Children (10-year olds)
| Agg1 | InA1 | HA1 | Agg2 | InA2 | HA2 | |
|---|---|---|---|---|---|---|
| MZ | ||||||
| Agg1 | 1.000 | |||||
| InA1 | 0.456 | 1.000 | ||||
| HA1 | 0.605 | 0.611 | 1.000 | |||
| Agg2 | 0.797 | 0.381 | 0.504 | 1.000 | ||
| InA2 | 0.385 | 0.722 | 0.483 | 0.443 | 1.000 | |
| HA2 | 0.518 | 0.497 | 0.772 | 0.587 | 0.620 | 1.000 |
| SD | 4.772 | 3.798 | 2.905 | 4.601 | 3.829 | 2.934 |
| DZ | ||||||
| Agg1 | 1.000 | |||||
| InA1 | 0.454 | 1.000 | ||||
| HA1 | 0.587 | 0.615 | 1.000 | |||
| Agg2 | 0.442 | 0.230 | 0.271 | 1.000 | ||
| InA2 | 0.232 | 0.186 | 0.227 | 0.439 | 1.000 | |
| HA2 | 0.254 | 0.208 | 0.276 | 0.582 | 0.620 | 1.000 |
| SD | 4.865 | 4.065 | 3.081 | 4.682 | 4.072 | 3.204 |
| Missing values (individuals) for twin1 and twin2 | |||||||
|---|---|---|---|---|---|---|---|
| Agg1 | InA1 | HA1 | Agg2 | InA2 | HA2 | ||
| Total sample size (number of pairs) and marginal number of missing* values | |||||||
| MZ | 4209 | 33 | 1125 | 1115 | 65 | 1120 | 1113 |
| DZ | 7136 | 33 | 1703 | 1696 | 100 | 1727 | 1712 |
MZ and DZ correlation matrices of within-person, twin correlations (in bold) and cross-twin cross-trait correlations and standard deviations (corrected for sex and age) for Aggression (Agg), Inattention (InA) and hyperactivity (HA) in twin 1 and twin 2
SD standard deviation
*In the earlier birth cohorts data on InA and HA were not collected