Table 2.
Outcomes measures and time points
| Outcome measure | Baseline | 4 months | 8 months | 12 months |
| Demographic data | x | |||
| PROMIS pain interference short form (8A)31 | x | x | x | x |
| Self-reported opioid use (mean morphine equivalents of opioid used in the preceding 4 weeks) | x | x | x | x |
| Opioid prescription from GP records | x | |||
| EQ-5D-5L34 | x | x | x | x |
| SF-12 V246 | x | x | x | x |
| Short opiate withdrawal scale35 | x | x | x | x |
| PROMIS pain intensity short form (3A)32 33 | x | x | x | x |
| Pittsburgh sleep quality index47 | x | x | x | x |
| Hospital anxiety and depression scale48 | x | x | x | x |
| Pain self efficacy questionnaire49 | x | x | x | x |
|
Participant ratings of global improvement and satisfaction with treatment
Patient global impression of change |
x | x | x | x |
|
Symptoms and adverse events
Passive capture of spontaneously reported adverse events and symptoms and use of open-ended prompts |
x | x | x | x |
GP, general practitioner; PROMIS, Patient-Reported Outcomes Measurement Information System.