Table 2.

Means and Standard Deviations (SD) of the Mismatch Negativity (MMN) Peak Amplitudes and Latencies at the Surface Electrodes Across the Groups

	HC		CHR-Ra		CHR-NRb		Statistical Analysisc		Post Hoc Analysisd
	(N = 47)		(N = 17)		(N = 31)
	Mean	SD	Mean	SD	Mean	SD	F	P	A vs B	A vs C	B vs C
Amplitude (μV)
F3	−2.2	1.1	−2.5	1.0	−1.8	0.8	4.627	.012*	.955	.008*	.019*
Fz	−2.7	1.2	−3.0	1.2	−2.2	1.0	5.875	.004**	.814	.002**	.014*
F4	−2.7	1.2	−3.0	1.1	−2.4	0.9	3.614	.031*	.793	.013*	.060
FC3	−1.9	1.0	−2.0	0.8	−1.7	0.7	2.009	.140	.745	.058	.189
FCz	−2.7	1.7	−2.7	1.2	−2.2	0.8	6.491	.002**	.225	.001**	.067
FC4	−2.6	1.2	−2.5	0.9	−2.3	0.9	1.200	.306	.519	.125	.498
Latency (ms)
F3	181.9	25.9	173.0	25.0	170.7	24.3	1.464	.237	.269	.101	.764
Fz	182.5	25.1	177.3	23.6	172.9	21.9	1.904	.155	.304	.055	.533
F4	182.4	25.5	174.8	24.2	170.9	21.3	3.694	.029*	.093	.009**	.571
FC3	177.5	29.2	176.8	26.4	173.6	26.8	0.484	.618	.656	.328	.693
FCz	183.3	22.5	178.2	17.9	174.7	22.4	1.154	.320	.450	.133	.591
FC4	175.5	23.4	175.4	24.2	162.3	15.8	4.351	.016*	.727	.006**	.044*

Note: HC, healthy control; CHR, clinical high risk; A, HC; B, CHR-R; C, CHR-NR.

^aRemitted at last follow-up point.

^bDid not remit at last follow-up point.

^cAnalysis of variance with age as covariate.

^d P value of post hoc analysis using simple contrast test.

*The mean difference is significant at the .05 level.

**The mean difference is significant at the .005 level.