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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Int J Dev Neurosci. 2019 Jan 25;73:83–88. doi: 10.1016/j.ijdevneu.2019.01.005

Table 4.

The surface based cortical measurements in RTT/RTT-l and NC participants

RTT/RTT-1
(N=8)
Mean [SD]		 NC (N=16)
Mean [SD]		 The rate of
RTT/RTT-1
to NC		 Absolute
Cohen’s d 		P value
Gyrification Index 3.71 [0.28] 3.78 [0.14] 0.98 0.36 .41
L gyrification index 2.71 [0.20] 2.76 [0.10] 0.98 0.38 .39
R gyrification index 2.71 [0.19] 2.79 [0.11] 0.97 0.55 .21
L cortex surface area (mm2) 87420 [12932] 91680 [8844] 0.95 0.41 .35
R cortex surface area (mm2) 87442 [12319] 92588 [8353] 0.94 0.53 .24
L cortex average thickness (mm) 2.86 [0.35] 2.73 [0.30] 1.04 0.38 .38
R cortex average thickness (mm) 2.88 [0.38] 2.74 [0.288] 1.05 0.42 .34
L cortex volume (mm3) 240211 [41297] 245002 [37804] 0.98 0.12 .78
R cortex volume (mm3) 240722 [33831] 247545 [36334] 0.97 0.19 .66

Abbreviation; RTT, Rett syndrome; RTT-l, Rett-like syndrome; NC, Normal controls; SD, standard deviation; L, left hemisphere; R, right hemisphere;