Table 3
The explained variance (Adjusted R2) and associations between disability as outcome and predictors (entered in 5 blocks) explored by linear regression analysis, (n = 939)
| Blocks of predictors | Block 1 | Block 1–2 | Block 1–3 | Block 1–4 (Final model) | Block 1-5b | |
|---|---|---|---|---|---|---|
| Adjusted R2 | Adjusted R2 | Adjusted R2 | Adjusted R2 | Adjusted R2 | ||
| 0.30 | 0.37 | 0.37 | 0.37 | 0.60 | ||
| Coefficients (95% CI) | Coefficients (95% CI) | Coefficients (95% CI) | Coefficients (95% CI) | Coefficients (95% CI) | ||
| Patient previous course of pain (n, %) | ||||||
| Single episode | Block 1 | Ref | Ref | Ref | Ref | Ref |
| Episodic pain | 3.54 (0.71 to 6.37) | 2.25 (-0.48 to 4.97) | 2.22 (-0.51 to 4.95) | 2.21 (-0.52 to 4.94) | 0.24 (-1.97 to 2.44) | |
| Mild pain/recovering | 4.66 (1.06 to 8.26) | 3.65 (0.19 to 7.12) | 3.46 (-0.02 to 6.94) | 3.40 (-0.07 to 6.87) | 1.97 (-0.83 to 4.78) | |
| Fluctuating pain | 12.52 (9.64 to 15.40) | 9.86 (7.04 to 12.67) | 9.68 (6.85 to 12.50) | 9.60 (6.78 to 12.43) | 3.08 (0.71 to 5.44) | |
| Moderate/severe pain | 19.54 (14.17 to 24.92) | 16.10 (10.94 to 21.26) | 15.82 (10.64 to 21.00) | 15.77 (10.59 to 20.96) | 5.28 (1.01 to 9.55) | |
| Neither/ Unsure | 5.83 (0.74 to 10.92) | 6.42 (1.54 to 11.30) | 6.25 (1.36 to 11.14) | 6.20 (1.31 to 11.09) | 2.66 (-1.27 to 6.60) | |
| Patient expected course of pain (n, %) | ||||||
| Single episode | Block 2 | Ref | Ref | Ref | Ref | Ref |
| Episodic pain | 5.41 (3.29 to 7.54) | 4.74 (2.72 to 6.77) | 4.75 (2.72 to 6.77) | 4.67 (2.63 to 6.70) | 4.33 (2.69 to 5.96) | |
| Mild pain/recovering | 5.12 (2.26 to 7.98) | 4.11 (1.38 to 6.84) | 4.27 (1.53 to 7.00) | 4.20 (1.45 to 6.94) | 3.83 (1.63 to 6.02) | |
| Fluctuating pain | 8.35 (5.81 to 10.90) | 7.00 (4.58 to 9.43) | 6.93 (4.49 to 9.37) | 6.86 (4.37 to 9.35) | 5.60 (3.58 to 7.62) | |
| Moderate/severe pain | 27.06 (16.64 to 37.48) | 25.62 (15.79 to 35.46) | 25.97 (16.12 to 35.82) | 25.75 (15.86 to 35.65) | 13.73 (5.06 to 22.39) | |
| Neither/ Unsure | 4.88 (2.20 to 7.56) | 3.64 (1.08 to 6.20) | 3.64 (1.08 to 6.20) | 3.61 (1.04 to 6.18) | 3.34 (1.29 to 5.40) | |
| Radiating pain to shoulder and/or elbow (Ref.: yes) | -1.45 (-3.18 to 0.29) | -1.31 (-3.06 to 0.43) | -1.27 (-3.02 to 0.48) | -1.30 (-2.69 to 0.09) | ||
| Number of MSK pain sites | 1.79 (1.43 to 2.14) | 1.44 (0.87 to 2.02) | 1.44 (0.87 to 2.02) | 0.56 (0.09 to 1.03) | ||
| Education level | ||||||
| Low | Block 3 | Ref | Ref | Ref | ||
| Medium | -1.65 (-4.76 to 1.47) | -1.64 (-4.76 to 1.47) | -0.04 (-2.54 to 2.45) | |||
| High | -2.19 (-5.27 to 0.89) | -2.19 (-5.27 to 0.89) | -0.67 (-3.13 to 1.80) | |||
| Physical leisure activity (Ref.: yes) | -2.25 (-5.63 to 1.12) | -2.19 (-5.57 to 1.18) | -1.23 (-3.94 to 1.48) | |||
| Physical leisure activity#Number of MSK pain-sites | 0.48 (-0.17 to 1.13) | 0.47 (-0.19 to 1.12) | 0.22 (-0.31 to 0.74) | |||
| Consultation-type | ||||||
| First-time consultation | Block 4 | Ref | Ref | |||
| Follow-up consultation | 1.31 (-0.73 to 3.35) | 2.04 (0.39 to 3.68) | ||||
| Maintenance consultation | 1.12 (-0.78 to 3.03) | 3.16 (1.62 to 4.70) | ||||
| Baseline NDI | Block 5b | 0.56 (0.51 to 0.61) | ||||
Note: The 95% C.I not including 0 are marked in bold, The NDI is transformed to a 0–100 scale for both baseline and outcome