Table 4.
Multilevel model examining the influence of state anxiety and trait catastrophizing on the time course of IL-6 responses during the nonpainful session among participants with chronic pain
| Fixed effects | β | SE | t | p-value |
|---|---|---|---|---|
| Step 1 | ||||
| Intercept | 2.50 | 0.635 | 3.94 | <0.001 |
| Time | 0.243 | 0.051 | 4.76 | <0.001 |
| Pain-magnification (PCS) | 0.16 | 0.25 | 0.66 | ns |
| Time × pain-magnification (PCS) | −0.028 | 0.020 | −1.40 | ns |
| Step 2 | ||||
| Intercept | 2.43 | 0.62 | 3.89 | <0.001 |
| Time | 0.25 | 0.052 | 4.76 | <0.001 |
| Anxiety | 0.0002 | 0.005 | 0.038 | ns |
| Pain-magnification (PCS) | 0.178 | 0.021 | 0.709 | ns |
| Time × pain-magnification (PCS) | −0.032 | 0.021 | −1.54 | ns |
Notes: Time and anxiety are Level 1 variables centered within participants. Catastrophizing is a Level 2 variable centered at the grand mean. β, unstandardized regression coefficient.
Abbreviations: IL, interleukin; ns, nonsignificant; PCS, Pain Catastrophizing Scale; SE, standard error.