Table 3.
Growth rates and rates of change (slope) of the adjusted monthly positive rate for different substances across the study period
| Substance | Time period | |||||||
|---|---|---|---|---|---|---|---|---|
| Overall | Pre-pandemic | Pandemic | Post-pandemic | |||||
| Growth rate | Rate of change | Growth rate | Rate of change | Growth rate | Rate of change | Growth rate | Rate of change | |
| Any | 0.1267 | + 0.0001%* | 0.0532 | + 0.0002%* | 0.0851 | + 0.0001%* | -0.0155 | + 0.0001%* |
| THC | 4.7413 | + 0.0922%* | 1.1361 | + 0.0406%* | 0.5697 | + 0.0304%* | 0.0172 | + 0.1178%* |
| Amphetamines | -0.0664 | -0.0069%* | 0.0155 | + 0.0046% | 0.1464 | + 0.0217%* | -0.5038 | -0.0663%* |
| Opioids | 0.0813 | -0.0055%* | -0.2736 | -0.0127% | 0.2207 | + 0.0022% | -0.1401 | -0.0046% |
*: significant rate of change according to the OLS regression results using p < 0.05