Table 2.
Group EEG and self-report data pre and post treatment
| Pre-treatment | Post-treatment | Test statistics | |||||
|---|---|---|---|---|---|---|---|
| M | (SD) | M | (SD) | Wilcoxon | p | r | |
| Neurofeedback (n = 18) | |||||||
| Somatic self-efficacy | 2.93 | (0.91) | 3.79 | (0.81) | 6.5 | < .001** | .58 |
| EEG high beta % | 4.68 | (2.97) | 3.19 | (1.32) | 130.0 | .027* | .32 |
| EEG low beta % | 7.34 | (4.21) | 6.27 | (2.93) | 114.0 | .115 | .21 |
| EEG SMR % | 7.97 | (3.86) | 8.12 | (3.63) | 83.0 | .466 | .02 |
| EEG alpha % | 13.80 | (6.96) | 15.85 | (6.96) | 53.0 | .084 | .24 |
| EEG theta % | 16.89 | (5.00) | 17.79 | (4.67) | 57.0 | .115 | .21 |
| EEG delta % | 49.32 | (16.43) | 48.80 | (11.87) | 100.0 | .276 | .11 |
| Binge eating episodes | 4.38 | (2.77) | 3.27 | (3.34) | 105.5 | .027* | .33 |
| Mental imagery (n = 18) | |||||||
| Somatic self-efficacy | 2.71 | (0.89) | 3.41 | (1.06) | 16.5 | .006** | .47 |
| EEG high beta % | 4.04 | (2.57) | 3.39 | (2.06) | 111.0 | .142 | .19 |
| EEG low beta % | 7.01 | (2.80) | 6.18 | (3.11) | 119.0 | .077 | .24 |
| EEG SMR % | 8.85 | (3.70) | 8.44 | (4.42) | 97.0 | .320 | .08 |
| EEG alpha % | 16.18 | (6.61) | 18.12 | (8.32) | 73.0 | .305 | .09 |
| EEG theta % | 18.39 | (3.64) | 17.62 | (3.19) | 113.0 | .123 | .20 |
| EEG delta % | 45.53 | (10.50) | 46.24 | (13.28) | 87.0 | .483 | .01 |
| Binge eating episodes | 4.50 | (3.84) | 2.83 | (3.49) | 120.0 | .020* | .35 |
Test statistics: within-groups t-tests; p-values: one-sided, * p < .05; ** p < .01. Conventions for effect size r: r ≥ .10 small effect; r ≥ .30 medium effect; r ≥ .50 large effect. For p-values of group-comparisons used for hypothesis testing (H1, bold print) are corrected for multiple comparisons (Holm); p-values of all other exploratory comparisons are reported without corrections for multiple testing