Absolute amount and mean grams of each opioid prescribed over the study period, and the linear correlation between monthly total and time
| Opioid | Total amount prescribed over study period, g | Mean g/month prescribed in England | Increase or decrease over time (Spearman’s r) |
|---|---|---|---|
| Buprenophine | 92 500.3 | 2151.2 | 0.86 |
| Codeine | 27 922 622.7 | 649 363.3 | 0.89 |
| Dihydrocodeine | 22 190 184.3 | 516 050.8 | −0.27 |
| Fentanyl | 2489.5 | 57.9 | 0.18 |
| Methadone | 1 931 295.7 | 44 913.8 | −0.97 |
| Morphine | 4 835 679.9 | 112 457.7 | 0.75 |
| Oxycodone | 2 719 720.2 | 63 249.3 | 0.86 |
| Tramadol | 139 222 060.4 | 3 237 722.3 | 0.80 |