| Time | Group | Scores (Mean ± SD) | |||
| Pain* | Interference* | Relief* | HAMA** | ||
| ΔT (T1 - T0) | Biofeedback | −4.9 ± 0.9 | −5.1 ± 1.1 | 4.6 ± 1.2 | −7.2 ± 3.7 |
| Control | −1.0 ± 0.4 | −0.9 ± 0.3 | 1.1 ± 0.6 | −2.2 ± 2.1 | |