Components of the responder index.
| PGA | LBP VAS | RMDQ | |||||
|---|---|---|---|---|---|---|---|
| > 30% Improvement | ≥ 30% Improvement | < 20% Worsening | |||||
| No | Yes | No | Yes | No | Yes | Total (%) | |
| Nonresponder | 357 | 60 | 266 | 151 | 90 | 327 | 417 (52.7) |
| Responder | 0 | 374 | 0 | 374 | 0 | 374 | 374 (47.3) |
| Total (%) | 357 (45.1) | 434 (54.9) | 266 (33.6) | 525 (66.4) | 90 (11.4) | 701 (88.6) | 791 |
| κ coefficient | 0.849 | 0.625 | 0.207 | ||||
PGA: patient global assessment; LBP: low back pain; VAS: visual analog scale; RMDQ: Roland-Morris Disability Questionnaire.