Table 1.
Descriptive statistics on the twin sample
| Pair type | Number of complete pairs |
Mean age (SD) |
Prevalence |
||
|---|---|---|---|---|---|
| Drug abuse (%) |
Criminal behavior (%) |
Alcohol use disorders (%) |
|||
| Monozygotic twins male–male | 2,798 | 38.3 (8.1) | 3.0 | 14.8 | 3.4 |
| Dizygotic twins male–male | 2,585 | 40.7 (8.4) | 2.2 | 15.7 | 4.2 |
| Monozygotic twins female– female |
3,403 | 38.2 (8.2) | 1.6 | 5.3 | 1.8 |
| Dizygotic twins female–female | 2,853 | 40.4 (8.5) | 1.4 | 5.6 | 1.8 |
| Dizygotic twins male–female | 8,964 | 37.4 (10.1) | M: 4.2 F:2.1 | M: 16.8 F: 6.4 | M: 4.9 F:2.2 |