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. Author manuscript; available in PMC: 2008 May 5.

Published in final edited form as: Clin Neurophysiol. 2004 Jul;115(7):1583–1591. doi: 10.1016/j.clinph.2004.02.015

Table 5.

Summary of F-ratios from repeated measures ANCOVA for P3a and P3b amplitude

	P3a	P3b
Frontal electrodes
Group	F_1,27 = 6.51^**	F_1,27 = 5.97^*
Electrode	F_4,108 = 16.34^***	F_4,108 = 3.99^*
Group × electrode	F_4,108 = 4.36^**	F_4,108 = 4.29^**
Central electrodes
Group	F_1,27 = 9.76^**	F_1,27 = 3.71^*
Electrode	F_7,189 = 4.92^**	F_7,189 = 1.54
Group × electrode	F_7,189 = 3.93^**	F_7,189 = 1.15
Parietal electrodes
Group	F_1,27 = 7.96^**	F_1,27 = 4.53^*
Electrode	F_5,135 = 2.93^*	F_5,135 = 3.61^*
Group × electrode	F_5,135 = 3.88^**	F_5,135 = 1.81
Temporal electrodes
Group	F_1,27 = 3.80	F_1,27 = 1.78
Electrode	F_5,135 = 5.72^***	F_5,135 = 1.25
Group × electrode	F_5,135 = 2.02	F_5,135 = 0.61
Occipital electrodes
Group	F_1,27 = 3.11	F_1,27 = 0.34
Electrode	F_2,54 = 10.35^***	F_2,54 = 3.06
Group × electrode	F_2,54 = 8.83^**	F_2,54 = 4.28^*

^*

P < 0.05,

^**

P ≤ 0.01,

^***

P ≤ 0.001 with BDI as covariate.