Table II. —Distribution of WIP questionnaire, PCS, ODI and pain intensity NRS scores.
| Parameter | Mean | SD | 25th% | 50th% | 75th% | Floor effect | Ceiling effect |
|---|---|---|---|---|---|---|---|
| WIP (0-30) | 21.96 | 4.99 | 18 | 23 | 26 | 0% | 0% |
| Factor 1 (0-21) | 15.81 | 3.94 | 13 | 16 | 19 | 0% | 0% |
| Factor 2 (0-9) | 6.15 | 2.04 | 5 | 6 | 8 | 0% | 0% |
| PCS (13-52) | 19.27 | 9.82 | 12.25 | 19 | 28 | 0% | 0% |
| ODI (0-50) | 11.62 | 6.19 | 7 | 11 | 16 | 0% | 0% |
| NRS (0-10) | 4.32 | 2.06 | 3 | 4 | 6 | 0% | 0% |
WIP: Work in Progress; Factor 1: Self-drivenness to return to normal personal life with pain; Factor 2: Self-drivenness to return to work and reduce the dependence of health services; PCS: Pain Catastrophising Scale; ODI: Oswestry Disability Index; NRS: Numerical Rating Scale.