TABLE 7.
Overview of the results of the correlation analysis.
| Intensity ratings |
Unpleasantness ratings |
|||
| Sitting | Standing | Sitting | Standing | |
| Global alpha | r = 0.34; p = 0.14 | r = 0.16; p = 0.51 | r = 0.46; p = 0.04+ | r = 0.11; p = 0.65 |
| RM-alpha | r = −0.40; p = 0.082 | r = −0.41; p = 0.073 | ||
| LP-alpha | r = 0.43; p = 0.060 | r = 0.54; p = 0.015+ | ||
| HADS-A | r = 0.048; p = 0.84 | r = −0.11; p = 0.64 | r = 0.10; p = 0.68 | r = −0.038; p = 0.87 |
| HADS-D | r = 0.081; p = 0.73 | r = 0.30; p = 0.20 | r = 0.12; p = 0.60 | r = 0.50; p = 0.026+ |
| BPI-average | r = −0.18; p = 0.47 | r = −0.042; p = 0.87 | r = −0.041; p = 0.87 | r = 0.13; p = 0.60 |
| BPI-worst | r = −0.25; p = 0.30 | r = 0.15; p = 0.54 | r = −0.057; p = 0.82 | r = 0.19; p = 0.43 |
| BPI-least | r = 0.11; p = 0.65 | r = −0.29; p = 0.23 | r = 0.20; p = 0.41 | r = −0.23; p = 0.35 |
| BPI-I | r = −0.18; p = 0.45 | r = 0.21; p = 0.39 | r = −0.12; p = 0.63 | r = 0.32; p = 0.18 |
| PSEQ | r = −0.055; p = 0.82 | r = −0.35; p = 0.14 | r = 0.040; p = 0.87 | r = −0.40; p = 0.077 |
| MHLC-I | r = 0.19; p = 0.43 | r = −0.014; p = 0.96 | r = 0.23; p = 0.34 | r = 0.077; p = 0.75 |
| MHLC-O | r = 0.090; p = 0.71 | r = 0.14; p = 0.56 | r = −0.036; p = 0.88 | r = 0.097; p = 0.68 |
| MHLC-C | r = −0.41; p = 0.075 | r = −0.040; p = 0.87 | r = -0.29; p = 0.21 | r = −0.020; p = 0.93 |
Correlations were calculated for the change in pain intensity/unpleasantness rating and standardized global alpha power (Global alpha). Post hoc correlations were also calculated for the two ROIs that showed significantly higher alpha power during 10 Hz stimulation compared to 1 Hz stimulation for the sitting condition only (RM-alpha and LP-alpha). Secondly, correlations were calculated between the change in pain intensity/unpleasantness rating and a number of questionnaire outcomes: the sum score of the HADS anxiety (HADS-A) and HADS depression subscale (HADS-D); the BPI average, worst, and least pain intensity rating (BPI-average, BPI-worst, and BPI-least) and the sum score for the seven pain interference items (BPI-I); the sum score for all PSEQ items (PSEQ); and a sum score for each of the three subscales of the MHLC, internal health locus of control, powerful others locus of control, and chance health of control (MHLC-I, MHLC-O, and MHLC-C). Significant correlations after correction for multiple comparisons are marked with ∗. Correlations that did not survive corrections for multiple comparisons but had a p < 0.05 are marked with +.