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. Author manuscript; available in PMC: 2018 Nov 1.
Published in final edited form as: Clin Neurophysiol. 2017 Sep 9;128(11):2358–2368. doi: 10.1016/j.clinph.2017.08.019

Table 1.

Descriptive statistics and twin intraclass correlations

Mean
(SD)		 Intraclass Correlations
(95% CI)
MZ DZ
AAU 7.01
(6.78)		 0.79
(0.74, 0.83)		 0.53
(0.40, 0.63)
Incongruent MFC theta power 2.50
(141)		 0.61
(0.53, 0.68)		 0.25
(0.09, 0.39)
Congruent MFC theta power 1.78
(112)		 0.59
(0.50, 0.66)		 0.24
(0.08, 0.38)
Incongruent MFC-dPFC theta functional connectivity 0.10
(0.09)		 0.38
(0.27, 0.48)		 0.23
(0.07, 0.37)
Congruent MFC-dPFC theta functional connectivity 0.06
(0.06)		 0.30
(0.19, 0.41)		 0.12
(−0.04, 0.27)

Notes: Abbreviations: AAU = adolescent alcohol use; MFC = medial frontal cortex (electrodes FCz/Cz); dPFC = dorsal prefrontal cortex (electrodes Fz/F1-4/AFz/AF3-4); MZ = monozygotic; DZ = dizygotic; CI = confidence interval. Values are in decibels for power, and weighted phase lag index units for theta-band connectivity (all relative to a −450 to −250 baseline). Sample sizes for intraclass correlations were 459 MZ twins (196 full pairs) and 259 DZ twins (105 full pairs).