Table 4.
Standardized proportions of additive genetic (A), shared (C) and non-shared (E) environmental variance in Cannabis Use (CU) and Peer Group Deviance (PGD) including the proportions of variance in PGD which can be explained by CU as well as variance which is unique to PGD.
| 15–17 years | 18–21 years | 22–25 years | ||||
|---|---|---|---|---|---|---|
| PGD | CU | PGD | CU | PGD | CU | |
| Total A variance (%)→ | 25 | 33 | 28 | 32 | 25 | 54 |
| A Explained by CU | 58% | - | 50% | - | 78% | - |
| A Unique to PGD | 42% | - | 50% | - | 22% | - |
| Total C variance (%) → | 27 | 45 | 26 | 39 | 24 | 16 |
| C Explained by CU | 73% | - | 66% | - | 25% | - |
| C Unique to PGD | 27% | - | 34% | - | 75% | - |
| Total E variance (%) → | 47 | 22 | 46 | 28 | 51 | 30 |
| E Explained by CU | 21% | - | 26% | - | 22% | - |
| E Unique to PGD | 79% | - | 74% | - | 78% | - |