Baseline score values regarding self-reported work ability, pain severity and interference, and health-related quality of life, presented as means and medians, and Cronbach′s α coefficient where applicable
| Measure scale | No of items | Scale minimum-maximum | Sample minimum-maximum | n (%) | Mean (SD) | Median | 25th, 75th percentile | Cronbach’s α coefficient |
| *Work ability index | 7 | 7–49 | 7–33 | 57 (89) | 13.7 (3.9) | 13.0 | 10.0, 21.5 | 0.75 |
| Brief pain inventory SF | 15 | NA | ||||||
| †Pain severity | 4 | 0–40 | 10–40 | 64 (100) | 6.3 (1.7) | 6.5 | 5.0, 7.5 | 0.82 |
| ‡Pain interference | 7 | 0–70 | 13–70 | 64 (100) | 6.9 (2.0) | 7.1 | 5.4, 8.6 | 0.85 |
| EQ-5D-5L | 6 | NA | NA | |||||
| §EQ-5D-5L index score | 5 | −0.16–0.84 | 51 (78) | 0.35 (0.27) | 0.34 | 0.16, 0.53 | NA | |
| ¶EQ-5D-5L visual analog scale (VAS) | 1 | 0–100 | 0–90 | 52 (81) | 42.4 (20.9) | 40.0 | 26.2, 0.54 | NA |
*WAI index range=7–49: 7–27=poor, 28–36=moderate, 37–43=good and 44–49=excellent work ability.
†0=no pain, 10=pain as bad as you can imagine.
‡0=does not interfere, 10=completely interferes.
§Worse than dead (<0) to 1 (full health), anchoring dead at 0. Index scores were calculated with the EQ-5D-5L Index Value Calculator, using the UK value set.
¶0=worse imaginable health to 100=best imaginable health.
NA, not available; SF, Short Form.