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| Month | No. of participants | Follow-up response rate compared to baseline |
|---|---|---|
| 0 | 609 | 100.0% |
| 1 | 455 | 74.7% |
| 2 | 410 | 67.3% |
| 3 | 396 | 65.0% |
| 4 | 402 | 66.0% |
| 5 | 282 | 46.3% |
| 6 | 325 | 53.4% |
| 7 | 300 | 49.3% |
| 8 | 308 | 50.6% |
| 9 | 286 | 47.0% |
| 10 | 287 | 47.1% |
| 11 | 287 | 47.1% |
| 12 | 450 | 73.9% |
Bolded row represent full questionnaires, the rest are short monthly questionnaires on pain severity and disability (RMDQ)
