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Hazard Ratios for Onset of Symptoms/the Prodrome, Using Frequency of Use as a Time-Dependent Covariate (Testing the Effects of Progression of Use)
| Frequency of Use | Substance | ||
|---|---|---|---|
| Cannabis | Alcohol | Tobacco | |
| None | 1.000 | 1.000 | 1.000 |
| Ever | 1.749* | 1.690 | 1.570 |
| Weekly | 2.415* | 2.043* | 1.632 |
| Daily | 2.065* | 1.763 | 1.825* |
significant difference compared to the “None” reference category
