Table 3 Estimates (95% confidence intervals) of fixed-effect coefficients for EEG features in the spectral distribution and inter-hemispheric connectivity groups. Coefficients of the mixed-model include intercept, gestational age (GA, age at birth in weeks), postnatal age (PNA, time after birth in days), and the interaction term between PNA and GA (PNA × GA).

From: Temporal evolution of quantitative EEG within 3 days of birth in early preterm infants

Feature type

Coefficients

group

Feature

FB

Intercept

PNA (days)

GA (weeks)

PNA × GA

spectral distribution

RSP (%)

δ

94

(93, 94)

   

θ

5.1

(4.5, 5.9)

−0.38

(−0.73, −0.06)

  

α

1.1

(−1.2, 3.4)

−1.7

(−3.4, 0)

7.7e-3

(−73.0e-3, 90.4e-3)

0.058

(−0.002, 0.117)

β

−0.69

(−1.32, −0.05)

 

0.041

(0.018, 0.063)

 

spectral flatness

δ

0.27

(0.26, 0.28)

   

θ

0.54

(0.39, 0.69)

9.5e-3

(3.8e-3, 15.7e-3)

7.0e-3

(1.6e-3, 12.2e-3)

 

α

0.62

(0.56, 0.69)

9.5e-3

(2.9e-3, 16.0-e3)

7.2e-3

(5.0e-3, 9.4e-3)

 

β

0.67

(0.66, 0.68)

   

fractal dimension

 

0.98

(0.82, 1.12)

 

0.012

(0.007, 0.018)

 

SEF (Hz)

 

6.2

(0.9, 11.9)

−3.6

(−7.1, −0.1)

−0.098

(−0.297, 0.089)

0.12

(0.01, 0.24)

connectivity

coherence

δ

0.45

(0.31, 0.58)

 

−0.011

(−0.015, −0.006)

 

θ

0.42

(0.33, 0.52)

 

−0.010

(−0.014, −0.007)

 

α

0.38

(0.28, 0.48)

 

−0.010

(−0.013, −0.006)

 

β

0.26

(0.18, 0.34)

 

−0.006

(−0.009, −0.003)

 
  1. Frequency bands (FB): 0.5–3 Hz (δ), 3–8 Hz (θ), 8–15 Hz (α), and 15–30 Hz (β). RSP: relative spectral power; SEF: spectral edge frequency.
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