Table 3.
Descriptive statistics and t-test results comparing intake (age 17) control cases who did or did not develop EXT by age 29 on both time-domain and time-frequency brain components.
| Identified as Controls at Age-17 and by Age-29… | Results of logistic regression analyses using age 17 brain components to predict EXT status by age 29 | |||||||
|---|---|---|---|---|---|---|---|---|
| Age-17 Brain Component | Remained Controls (n = 74) | Developed an EXT disorder (n = 73) | t-test Results | Effect Size | ||||
| Mean (SD) | Mean (SD) | p-values | Odds Ratio (OR) | OR 95% CI | p-value | |||
| P3 Amplitude | 27.14 (7.22) | 24.46 (7.61) | .034 | .359 | 1.050 | 1.004 | 1.098 | .032 |
| P2-N2-P3 Delta | 54.61 (29.14) | 44.68 (27.88) | .036 | .354 | 1.012 | 1.001 | 1.024 | .039 |
| Late P3 High-Delta | 52.19 (28.42) | 43.58 (25.69) | .060 | .326 | 1.012 | 0.999 | 1.025 | .059 |
| Late Slow-Wave Delta | 39.84 (21.97) | 31.68 (19.58) | .022 | .392 | 1.019 | 1.003 | 1.036 | .022 |
| N2 Theta | 29.76 (17.45) | 25.57 (17.14) | .130 | .253 | 1.014 | 0.995 | 1.034 | .146 |
| P3 Theta | 39.84 (24.35) | 35.05 (23.87) | .217 | .206 | 1.008 | 0.995 | 1.022 | .231 |
Note. The odds ratios (OR) represent the increase in odds of developing an EXT disorder for every unit decrease in the particular brain response. Thus, for P3 amplitude (OR = 1.050) every microvolt (μV) decrease was associated with a 5% increase for developing EXT.