Table 2
The explained variance (Adjusted R2) and associations between pain intensity as outcome and predictors (entered in 5 blocks) explored by linear regression analysis, (n = 941)
| Blocks of predictors | Block 1 | Block 1–2 | Block 1–3 | Block 1–4 (Final model) | Block 1-5a | |
|---|---|---|---|---|---|---|
| Adjusted R2 | Adjusted R2 | Adjusted R2 | Adjusted R2 | Adjusted R2 | ||
| 0.19 | 0.22 | 0.22 | 0.22 | 0.26 | ||
| 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 | 6.66 (1.76 to 11.55) | 5.16 (0.32 to 9.99) | 5.10 (0.26 to 9.95) | 5.14 (0.28 to 10.00) | 3.27 (-1.49 to 8.03) | |
| Mild pain/recovering | 8.96 (2.57 to 14.82) | 7.44 (1.40 to 13.49) | 7.30 (1.24 to 13.37) | 7.27 (1.20 to 13.35) | 5.71 (-0.21 to 11.63) | |
| Fluctuating pain | 17.10 (12.14 to 22.06) | 13.96 (8.98 to 18.94) | 13.78 (8.79 to 18.78) | 13.71 (8.71 to 18.71) | 9.85 (4.86 to 14.83) | |
| Moderate/severe pain | 25.43 (16.12 to 34.74) | 21.43 (12.21 to 30.66) | 21.09 (11.83 to 30.35) | 21.01 (11.74 to 30.29) | 12.45 (3.09 to 21.81) | |
| Neither/ Unsure | 10.17 (1.16 to 19.17) | 10.77 (1.84 to 19.70) | 10.57 (1.63 to 19.52) | 10.55 (1.60 to 19.51) | 8.37 (-0.21 to 16.95) | |
| Patient expected course of pain (n, %) | ||||||
| Single episode | Block 2 | Ref | Ref | Ref | Ref | Ref |
| Episodic pain | 9.40 (5.71 to 13.10) | 8.63 (5.00 to 12.56) | 8.62 (4.98 to 12.25) | 8.57 (4.91 to 12.23) | 7.10 (3.50 to 10.69) | |
| Mild pain/recovering | 8.06 (3.11 to 13.01) | 7.04 (2.17 to 11.91) | 7.15 (2.26 to 12.04) | 7.13 (2.21 to 12.04) | 6.15 (1.32 to 10.99) | |
| Fluctuating pain | 12.57 (8.18 to 16.98) | 11.07 (6.73 to 15.41) | 10.91 (6.54 to 15.27) | 10.94 (6.48 to 15.40) | 9.52 (5.14 to 13.91) | |
| Moderate/severe pain | 28.84 (10.96 to 46.74) | 27.22 (9.72 to 44.71) | 27.80 (10.25 to 45.35) | 27.71 (10.09 to 45.33) | 24.07 (6.86 to 41.29) | |
| Neither/ Unsure | 7.52 (2.86 to 12.19) | 6.22 (1.62 to 10.82) | 6.26 (1.65 to 10.86) | 6.26 (1.64 to 10.88) | 4.49 (-0.03 to 9.01) | |
| Radiating pain to shoulder and/or elbow (Ref.: yes) | -0.50 (-3.60 to 2.60) | -0.35 (-3.47 to 2.77) | -0.31 (-3.43 to 2.81) | -1.54 (-4.59 to 1.51) | ||
| Number of MSK pain sites | 1.91 (1.28 to 2.55) | 1.69 (0.66 to 2.73) | 1.69 (0.66 to 2.72) | 1.30 (0.29 to 2.31) | ||
| Education level | ||||||
| Low | Block 3 | Ref | Ref | Ref | ||
| Medium | -3.27 (-8.82 to 2.27) | -3.24 (-8.79 to 2.32) | -3.28 (-8.68 to 2.13) | |||
| High | -3.22 (-8.70 to 2.27) | -3.20 (-8.69 to 2.29) | -3.52 (-8.86 to 1.82) | |||
| Physical leisure activity (Ref.: yes) | -1.61 (-7.67 to 4.44) | -1.57 (-7.64 to 4.49) | -2.74 (-8.87 to 3.19) | |||
| Physical leisure activity#Number of MSK pain-sites | 0.29 (-0.88 to 1.45) | 0.28 (-0.89 to 1.45) | 0.46 (-0.68 to 1.61) | |||
| Consultation-type | ||||||
| First-time consultation | Block 4 | Ref | Ref | |||
| Follow-up consultation | 1.60 (-2.09 to 5.29) | 2.68 (-0.95 to 6.30) | ||||
| Maintenance consultation | 1.03 (-2.38 to 4.45) | 3.13 (-0.27 to 6.53) | ||||
| Baseline pain intensity | Block 5a | 2.23 (1.64 to 2.82) | ||||
Note: The 95% C.I not including 0 are marked in bold, The NRS pain intensity is transformed to a 0–100 scale for both baseline and outcome