Table 3.
Regression results for mean burst percentage (Burst%) and mean relative spectral power in delta, theta, and beta frequency bands. The log-transform of results are shown for CLASS QS estimates and visually labelled estimates from the clinician, as well as for non-state specific EEG epochs, for 31–38 week PMA range (optimal CLASS performance). For each measure, the slope (or b-coefficient, b), standard error (SE) of b, 95% confidence interval (CI), and p < 0.05 significance is presented. In case of quadratic correlations, coefficients b1 and b2 of the equation are provided (y = a + b1x + b2x2). The alpha band power showed no significant correlations, and was therefore omitted from this table.
| CLASS QS estimates | Visual QS estimates | Non-state specific EEG | |
|---|---|---|---|
| Log Burst% |
b = 0.045 SE: 0.004 95% CI: (0.036 to 0.053) linear correlation with PMA, p < 0.001 |
b = 0.045 SE: 0.005 95% CI: (0.035 to 0.055) linear correlation with PMA, p < 0.001 |
b = 0.035 SE: 0.006 95% CI: (0.023 to 0.047) linear correlation with PMA, p < 0.001 |
| Log relative delta power |
b = −0.014 SE: 0.004 95% CI: (−0.021 to −0.006) linear correlation with PMA, p < 0.01 |
b = −0.013 SE: 0.004 95% CI: (−0.022 to −0.004) linear correlation with PMA, p < 0.01 |
b = −0.010 SE: 0.005 95% CI: (−0.019 to −0.000) linear correlation with PMA, p < 0.05 |
| Log relative theta power |
b1 = −0.679 SE: 0.284 95% CI: (−1.253 to −0.104) b2 = 0.011 SE: 0.004 95% CI: (0.002 to 0.019) quadratic correlation with PMA, p < 0.05 |
b1 = −0.673 SE: −0.320 95% CI: (−1.334 to −0.012) b2 = 0.010 SE: 0.005 95% CI: (0.000 to 0.020) quadratic correlation with PMA, p < 0.05 |
b1 = −0.281 SE: 0.333 95% CI: (−0.956 to 0.392) b2 = 0.005 SE: 0.005 95% CI: (−0.005 to 0.014) no significant correlation with PMA, p = 0.35 |
| Log relative beta power |
b1 = 1.071 SE: 0.342 95% CI: (0.377 to 1.765) b2 = −0.016 SE: 0.005 95% CI: (−0.026 to −0.006) quadratic correlation with PMA, p < 0.05 |
b1 = 1.103 SE: 0.576 95% CI: (−0.060 to 2.267) b2 = −0.016 SE: 0.008 95% CI: (−0.033 to −0.000) quadratic correlation with PMA, p = 0.056 |
b1 = 0.389 SE: 0.507 95% CI: (−0.646 to 1.411) b2 = −0.007 SE: 0.007 95% CI: (−0.0203 to 0.007 no significant correlation with PMA, p = 0.428 |