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MJ use characteristics: early vs late onset
| MJ-related variables | Early MJ onset (n = 11) | Late MJ onset (n = 14) | T test (2-tailed) |
|---|---|---|---|
| Age of MJ onset | 14.46 ± 0.69 | 17.93 ± 2.13 | <0.01 |
| Smoking episodes/week | 18.76 ± 9.38 | 15.51 ± 7.19 | NS |
| Grams/week | 14.65 ± 18.97 | 6.66 ± 5.56 | NS |
| Duration of MJ use (years) | 8.82 ± 5.67 | 5.14 ± 4.42 | NS |
| Urinary THC concentration | 405.67 ± 318.36 | 743.74 ± 1091.07 | NS |
