Number of study participants prescribed opioids and the average number of prescriptions in different samples
| Prescription characteristics | London (n=320) | Midlands (n=383) | Full sample (n=703) | |||
| n | % | n | % | n | % | |
| Prescribed opioids | 180 | 56 | 233 | 61 | 413 | 59 |
| Buprenorphine | 21 | 6.6 | 24 | 6.3 | 45 | 6.4 |
| Codeine | 130 | 40.6 | 150 | 39.2 | 280 | 39.8 |
| Fentanyl | 5 | 1.6 | 3 | 0.8 | 8 | 1.1 |
| Morphine | 9 | 2.8 | 35 | 9.1 | 44 | 6.3 |
| Oxycodone | 6 | 1.9 | 9 | 2.3 | 15 | 2.1 |
| Tapentadol | 0 | 0.0 | 1 | 0.3 | 1 | 0.1 |
| Tramadol | 71 | 22.2 | 96 | 25.1 | 167 | 23.8 |
| Single opioid | 126 | 39.4 | 163 | 42.6 | 289 | 41.1 |
| Combination of opioids | 54 | 16.9 | 70 | 18.3 | 124 | 17.6 |
| 2 opioids | 48 | 15.0 | 57 | 14.9 | 105 | 14.9 |
| 3 opioids | 6 | 3.3 | 11 | 4.6 | 16 | 2.3 |
| 4 opioids | 0 | 0 | 2 | 0.8 | 2 | 0.5 |
| 5 opioids | 1 | 0.6 | 0 | 0 | 1 | 0.2 |
| Average number of opioid prescriptions over 12 months | 7.3 (SD=7.6) | 8.6 (SD=8.1) | 8.0 (SD=7.9) | |||