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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Neuroimage. 2008 Jul 3;42(4):1275–1284. doi: 10.1016/j.neuroimage.2008.06.027

Table 3. Individual and mean regression slopes for ECoG measures derived from the univariate linear regression models.

The one-sample t-test revealed that the mean regression slope for very high-frequency gamma (100–200 Hz), high-frequency gamma (64–100 Hz), low-frequency gamma (32–64 Hz), beta (16–32 Hz), and sigma spectral amplitudes (12–16 Hz) were significantly greater than zero.

ECoG Measure Regression Slope (R2) for Patient 1 Regression Slope (R2) for Patient 2 Regression Slope (R2) for Patient 3 Regression Slope (R2) for Patient 4 Regression Slope (R2) for Patient 5 Regression Slope (R2) for Patient 6 Mean Regression Slope (Mean R2 among Six Children 95%CI for the Mean Regression Slope
'Delta amplitude'; β D 0.00008
(0.0002)		 0.0013***
(0.14)		 0.00035*
(0.046)		 0.00044*
(0.046)		 0.00071***
(0.096)		 −0.00087***
(0.14)		 0.00033 (0.078) −0.0004, 0.0011
'Theta amplitude'; β T 0.0013
(0.025)		 0.0018**
(0.078)		 0.0015***
(0.17)		 0.0015**
(0.061)		 0.00056
(0.030)		 −0.0015***
(0.14)		 0.00088
(0.084)		 −0.0004, 0.0022
'Alpha amplitude'; β A 0.0088**
(0.13)		 0.0029**
(0.048)		 0.0024***
(0.23)		 0.0029*
(0.045)		 0.0012***
(0.10)		 −0.0009
(0.030)		 0.0029
(0.097)		 −0.0005, 0.0063
'Sigma amplitude'; β S 0.0161***
(0.16)		 0.0087***
(0.10)		 0.0035***
(0.22)		 0.0041
(0.023)		 0.0026***
(0.22)		 0.0013*
(0.041)		 0.0060*
(0.13)		 0.0002, 0.012
'Beta amplitude'; β B 0.0074***
(0.22)		 0.0026*
(0.047)		 0.0018***
(0.21)		 0.0025*
(0.034)		 0.0009***
(0.11)		 0.0017***
(0.25)		 0.0028*
(0.15)		 0.0004, 0.0052
'Low-frequency gamma amplitude'; β LG 0.0049**
(0.11)		 0.0036**
(0.061)		 0.0037***
(0.17)		 0.0037**
(0.074)		 0.0011***
(0.086)		 0.0020***
(0.28)		 0.0032**
(0.13)		 0.0017, 0.0046
'High-frequency gamma amplitude'; β HG 0.0094**
(0.12)		 0.012***
(0.23)		 0.0094***
(0.19)		 0.0067***
(0.098)		 0.0036***
(0.14)		 0.0039***
(0.19)		 0.0075**
(0.16)		 0.0040, 0.011
'Very high-frequency gamma amplitude'; β VHG 0.018***
(0.15)		 0.018***
(0.30)		 0.0055***
(0.18)		 0.0079***
(0.094)		 0.0032***
(0.26)		 0.0047***
(0.15)		 0.0095*
(0.19)		 0.0025, 0.017
'Spike frequency'; β SP −0.081***
(0.37)		 0.010
(0.017)		 0.006***
(0.15)		 −0.018
(0.014)		 0.006***
(0.29)		 −0.010*
(0.059)		 −0.015
(0.15)		 −0.050, 0.021
*

p-value<0.05.

**

p-value<0.01.

***

p-value<0.001.

Very high-frequency gamma amplitude measure as a predictor had the mean R-square among six patients to be 0.19 in the univariate regression analysis; this observation suggests that about one-fifth of variance of glucose metabolic pattern can be explained by very high-frequency gamma amplitude alone.