Table 1.

MMN/P3a mean amplitude (μV) and standard deviation values at frontal and temporal electrodes for each group

##Electrode	Controls	At-risk	ES d (r)
Location	Mean (SD)	Mean (SD)	(At-risk vs. controls)
FP1	−1.24 μV (1.11)	−0.60 μV (1.07)	−0.59 (−0.28)
FPz	−1.40 μV (1.17)	−0.38 μV (1.40)	−0.79 (−0.37)
FP2	−1.24 μV (1.15)	−0.32 μV (1.90)	−0.59 (−0.28)
F1	−1.37 μV (0.87)	−0.79 μV (0.81)	−0.69 (−0.33)
Fz	−1.09 μV (0.87)	−0.70 μV (1.20)	−0.37 (−0.19)
F2	−1.03 μV (1.05)	−0.80 μV (1.30)	−0.19 (−0.10)
FC1	−0.91 μV (0.59)	−0.67 μV (0.72)	−0.36 (−0.18)
FCz	−0.62 μV (0.73)	−0.52 μV (0.96)	−0.12 (−0.06)
FC2	−0.60 μV (0.76)	−0.63 μV (1.09)	0.03 (0.02)
C3	−1.56 μV (1.29)	−0.93 μV (0.98)	−0.55 (−0.27)
Cz	−0.19 μV (0.66)	−0.22 μV (0.80)	0.04 (0.02)
C4	−0.17 μV (0.74)	−0.42 μV (0.92)	0.30 (0.15)
TP9	1.69 μV (1.08)	0.93 μV (1.69)	0.54 (0.26)
TP10	1.55 μV (1.14)	0.71 μV (1.12)	0.74 (0.35)
P3a Fz	1.47 μV (1.00)	1.25 μV (1.34)	0.19 (0.09)
P3a Cz	0.29 μV (0.84)	0.81 μV (0.96)	−0.58 (−0.28)

Note: Effect sizes are calculated as the standardised mean differences: ES = (Mean of at-risk group minus the mean of controls)/Pooled SD. ‘μV’ = microvolts.