Table 1 Characteristics of EEG parameters and stroke lesion volume for the control group (n = 10), mild stroke group (n = 7), moderate stroke group (n = 7), and severe stroke group (n = 7).

From: Quantification of stroke lesion volume using epidural EEG in a cerebral ischaemic rat model

Variables

Control

Mild Stroke

Moderate Stroke

Severe Stroke

Test statistic

p value

Without auditory stimulation

RP beta

0.08 ± 0.09

0.09 ± 0.03

0.10 ± 0.04

0.10 ± 0.04

2.059 (3)

0.560

RP alpha

0.08 ± 0.05

0.07 ± 0.06

0.08 ± 0.04

0.07 ± 0.03

1.828 (3)

0.609

RP theta

0.19 ± 0.02

0.18 ± 0.02

0.18 ± 0.02

0.19 ± 0.02

4.022 (3)

0.259

RP delta

0.63 ± 0.12

0.66 ± 0.08

0.65 ± 0.05

0.63 ± 0.07

0.228 (3)

0.973

DAR

7.74 ± 7.31

9.30 ± 8.33

8.35 ± 5.66

9.26 ± 7.41

1.738 (3)

0.628

DTABR

4.64 ± 5.43

5.98 ± 3.03

4.57 ± 2.73

4.88 ± 3.30

0.494 (3)

0.920

With auditory stimulation

RP beta

0.17 ± 0.07

0.11 ± 0.04

0.10 ± 0.01

0.12 ± 0.04

6.967 (3)

0.073

RP alpha

0.14 ± 0.02

0.10 ± 0.03

0.09 ± 0.01

0.09 ± 0.02

22.388 (3)

0.001a,b,c

RP theta

0.31 ± 0.06

0.29 ± 0.04

0.25 ± 0.03

0.23 ± 0.03

19.427 (3)

 < 0.001b,c

RP delta

0.40 ± 0.07

0.49 ± 0.03

0.56 ± 0.02

0.58 ± 0.04

25.951 (3)

 < 0.001 a,b,c

DAR

3.01 ± 0.91

4.78 ± 1.50

5.89 ± 0.72

6.27 ± 2.29

24.566 (3)

 < 0.001 a,b,c

DTABR

2.18 ± 1.03

3.46 ± 1.19

4.02 ± 0.51

3.70 ± 2.02

12.600 (3)

0.006b,c

Amplitude (μV)

137.19 ± 50.14

124.16 ± 30.86

71.40 ± 32.49

51.18 ± 12.93

14.829 (3)

0.002c

Latency (s)

0.16 ± 0.03

0.20 ± 0.03

0.25 ± 0.02

0.27 ± 0.03

25.878 (3)

 < 0.001a,b,c

Lesion volume (mm3)

-

3.33 ± 0.37

4.14 ± 0.11

4.65 ± 0.29

17.818 (2)

 < 0.001†

  1. Data are presented as the median ± interquartile range. The values of test statistics are expressed as chi-square value and (df). The p values were derived using a Kruskal–Wallis test.
  2. aRepresents statistical significance after Bonferroni correction between the control group and mild stroke group.
  3. bRepresents statistical significance after Bonferroni correction between the control group and moderate stroke group.
  4. cRepresents statistical significance after Bonferroni correction between the control group and severe stroke group. In addition, stroke lesion volume was significantly different between each group†
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