Table 2.
Multilevel model-based mean scores at baseline and follow-up and the regression coefficients and odds ratios (95% CI) for the primary outcome measures
| Primary outcome measure | Protocol group | Guideline group | Regression coefficients (95% CI)a |
|---|---|---|---|
| Functional status (RDQ) | |||
| Baseline | 11.6 | 12.1 | |
| 6 weeks | 10.2 | 10.2 | 0.35 (−1.29; 1.98) |
| 13 weeks | 7.9 | 7.5 | 0.85 (−1.36; 3.06) |
| 26 weeks | 7.4 | 7.7 | 0.13 (−2.24; 2.50) |
| 52 weeks | 6.7 | 7.1 | 0.06 (−2.22; 2.34) |
| Overall effect: χ2 = 0.980; 4df (P = 0.91) | |||
| Regression coefficients (95% CI)b | |||
| Pain intensity (PI-NRS) | |||
| Baseline | 6.2 | 5.9 | |
| 6 weeks | 5.3 | 5.4 | −0.42 (−1.29; 0.46) |
| 13 weeks | 4.4 | 4.9 | −0.76 (−1.74; 0.23) |
| 26 weeks | 4.1 | 4.8 | −0.97 (−1.88; −0.06)* |
| 52 weeks | 3.9 | 4.6 | −1.02 (−2.14; 0.09) |
| Overall effect: χ2 = 5.212; 4df (P = 0.27) | |||
| Odds ratios (95% CI) | |||
| Perceived effect (GPE) (% yes) | |||
| 6 weeks | 14.2% | 20.4% | 0.65 (0.21; 2.01) |
| 13 weeks | 29.9% | 29.6% | 1.02 (0.37; 2.80) |
| 26 weeks | 38.2% | 39.8% | 0.93 (0.36; 2.43) |
| 52 weeks | 45.0% | 32.3% | 1.71 (0.67; 4.38) |
| Overall effect: χ2 = 4.968; 4df (P = 0.29) | |||
RDQ Roland Morris Disability Questionnaire, PI-NRS Pain Intensity Numerical Rating Scale, GPE general perceived effect, df degrees of freedom, CI confidence intervals
* P < 0.05
aAdjusted for baseline, ethnic background and work status
bAdjusted for baseline and ethnic background