Table 4.
Results of multilevel growth curve analysis of CPM of electric pain ratings
| 95% Confidence Interval | ||||
|---|---|---|---|---|
| Fixed Effects | Estimate | SE | lower | upper |
| Intercept | 37.778* | 2.029 | 33.782 | 41.775 |
| ALEs | 1.274 | 1.068 | −0.830 | 3.377 |
| CPM Phase | −6.420* | 1.143 | −8.682 | −4.158 |
| Stimulus Number | 0.753* | 0.103 | 0.550 | 0.955 |
| Suprathreshold Stimulus Intensity | 0.187* | 0.075 | 0.038 | 0.335 |
| Age | 0.144 | 0.087 | −0.026 | 0.315 |
| Sex | 0.948 | 0.964 | −0.949 | 2.846 |
| Body Mass Index (kg/m2) | 0.058 | 0.249 | −0.433 | 0.549 |
| Mean Arterial Pressure (mmHg) | −0.083 | 0.124 | −0.321 | 0.161 |
| Sleep Quality (PSQI) | −1.801 | 1.423 | −4.604 | 1.003 |
| Perceived Stress (PSS) | −0.103 | 0.236 | −0.568 | 0.361 |
| Psychological Distress (log GSI) | 35.598* | 17.402 | 1.326 | 69.871 |
| General Health (SF-36-GH) | −0.139 | 0.097 | −0.329 | 0.052 |
| Race (NA) | 0.227 | 2.747 | −5.183 | 5.637 |
| ALEs × CPM Phase | −0.568 | 0.584 | −1.722 | 0.586 |
| ALEs × Race (NA) | −1.358 | 1.408 | −4.131 | 1.415 |
| CPM Phase × Race (NA) | −1.087 | 1.502 | −4.056 | 1.882 |
| ALEs × CPM Phase × Race (NA) | 0.780 | 0.799 | −0.800 | 2.359 |
| 95% Confidence Interval | ||||
| Random Effects | Estimate | SE | lower | upper |
| AR1 diagonal | 71.303* | 9.754 | 54.534 | 93.228 |
| AR1 rho | 0.660* | 0.052 | 0.545 | 0.751 |
| Intercept Variance | 238.585* | 25.217 | 193.944 | 293.502 |
| Intercept and CPM Phase Covariance | −57.001* | 12.077 | −80.672 | −33.330 |
| CPM Phase Variance | 53.967* | 10.021 | 37.503 | 77.658 |
Note. Estimates show the unstandardized relationship between each predictor and the criterion. Bolded text indicates significance at *p < .05. SE=Standard error of estimate/coefficient. PSQI=Pittsburgh Sleep Quality Index. PSS=Perceived Stress Scale. GSI=Global Severity Index of the Symptom Checklist 90. SF-36-GH= General Health Scale of the Short Form Health Survey. NA=Native American. ALEs=Adverse Life Events. CPM=Conditioned Pain Modulation. Sex was coded −1=male and 1=female. Race was coded 0=non-Hispanic White and 1=Native American. AR1=first-order autoregressive structure.