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Association between measures constituting the regular substance involvement (RSI) factor and varying levels (represented by the 1st, 2nd, 3rd and 4th quartile) of peer substance involvement (PSI)
| Prevalence in each quartile of PSI | χ2df=3 | ||||
|---|---|---|---|---|---|
| 1st | 2nd | 3rd | 4th | ||
| Regular alcohol use | 40.6% | 40.3% | 65.6% | 69.7% | 163.1 |
| Regular cigarette smoking | 20.1% | 19.4% | 40.0% | 63.3% | 314.0 |
| Repeated cannabis use | 1.7% | 1.8% | 5.0% | 14.8% | 114.0 |
