Table 6 Parameters of linear regression for different bicoherence estimates in association with graduated levels of anaesthesia.

δ_δ

1.217 (1.105 - 1.33)

21.27

< 0.001

0.462

0.152

δ_θ

0.985 (0.906 - 1.063)

24.61

< 0.001

0.509

0.168

δ_α

0.269 (0.227 - 0.311)

12.66

< 0.001

0.445

0.060

δ_β

0.066 (0.051 - 0.081)

8.67

< 0.001

0.356

0.036

θ_θ

0.403 (0.325 - 0.48)

10.21

< 0.001

0.426

0.044

θ_α

0.19 (0.145 - 0.236)

8.25

< 0.001

0.476

0.024

θ_β

0.007 (-0.01 - 0.024)

0.83

0.408

0.468

0.002

α_α

0.186 (0.115 - 0.258)

5.14

< 0.001

0.439

0.011

α_β

-0.002 (-0.024 - 0.019)

-0.21

0.831

0.499

0.002

β_β

-0.032 (-0.053 - -0.011)

-2.95

0.003

0.723

0.004

(b)

Bifrequency region

Coef (95% conf. interval)

z value

p-value

ρ

R²

δ_δ

1.883 (1.728 - 2.038)

23.82

< 0.001

0.433

0.184

δ_θ

1.903 (1.758 - 2.048)

25.74

< 0.001

0.472

0.191

δ_α

0.786 (0.674 - 0.898)

13.74

< 0.001

0.396

0.072

δ_β

0.377 (0.304 - 0.449)

10.17

< 0.001

0.195

0.053

θ_θ

1.232 (1.069 - 1.394)

14.82

< 0.001

0.448

0.080

θ_α

0.582 (0.47 - 0.695)

10.18

< 0.001

0.502

0.036

θ_β

0.117 (0.05 - 0.184)

3.44

0.001

0.343

0.005

α_α

0.587 (0.432 - 0.742)

7.44

< 0.001

0.458

0.020

α_β

0.207 (0.128 - 0.287)

5.13

< 0.001

0.391

0.012

β_β

-0.059 (-0.133 - 0.015)

-1.56

0.119

0.656

0.008