Table 3 Test-retest reliability for electroencephalography-based and reaction time measures in community control and clinical high risk groups.

Measure	Electrodes included in average	Community Control (n = 84)	Clinical High Risk (n = 571)
Measure	Electrodes included in average	G-coefficient^a	G-coefficient
Event-related potential measures
AOD^b Target P300 (P3b)	CPz, CP1, CP2, Pz, P1, P2	0.66	0.72
AOD Novel P300 (P3a)	FCz, FC1, FC2, Cz, C1, C2	0.74	0.70
VOD^c Target P300 (P3b)	CPz, CP1, CP2, Pz, P1, P2	0.77	0.76
VOD Novel P300 (P3a)	Cz, C1, C2, CPz, CP1, CP2	0.78	0.72
Mismatch Negativity	Fz, F1, F2, FCz, FC1, FC2	0.73	0.78
Event-related oscillation measures
40-Hz ASSR^d Inter-trial Coherence	FCZ, FC1, FC2, Cz, C1, C2	0.68	0.68
40-Hz ASSR Evoked Power	Fz, F1, F2, FCz, FC1, FC2	0.64	0.75
40-Hz ASSR Total Power	FCZ, FC1, FC2, Cz, C1, C2	0.67	0.65
Power spectral density measures
Resting EEG^e (eyes open): Delta	Fz, FCz	0.80	0.77
Resting EEG (eyes closed) Delta	Fz, FCz	0.86	0.79
Resting EEG (eyes open): Theta	Fz, FCz	0.81	0.81
Resting EEG (eyes closed) Theta	Fz, FCz	0.89	0.84
Resting EEG (eyes open): Alpha	Pz, P1, P2, POz, PO3, PO4	0.88	0.85
Resting EEG (eyes closed) Alpha	Pz, P1, P2, POz, PO3, PO4	0.85	0.79
Resting EEG (eyes open): Beta	AF3, AF4, F3, F4, F5, F6, POz, PO3, PO4	0.66	0.62
Resting EEG (eyes closed) Beta	AF3, AF4, F3, F4, F5, F6, POz, PO3, PO4	0.71	0.72
Resting EEG (eyes open): Gamma	AFz, AF3, AF4, Fz, F3, F4, F5, F6	0.54	0.52
Resting EEG (eyes closed) Gamma	AFz, AF3, AF4, Fz, F3, F4, F5, F6	0.44	0.49
Reaction time measures
AOD Target Median Reaction Time		0.68	0.78
VOD Target Median Reaction Time		0.67	0.79

Note. G-coefficients are estimated for P300 and MMN amplitudes, 40-Hz ASSR measures, and for EEG absolute power spectral density for frequency bands Delta (1–3 Hz), Theta (4-7 Hz), Alpha (8-12 Hz), Beta (13-30 Hz), and Gamma (31-48 Hz).
Participant samples are based on EEG sessions with quality control ratings ≥ 3.
^aG-Generalizability coefficient; an intraclass correlation coefficient reflecting test-retest reliability over baseline and month-2 EEG sessions.
^bAOD-auditory oddbal task.
^cVOD-visual oddbal task.
^dASSR-auditory steady state response.
^eEEG-electroencephalography.

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