Table 3.

Descriptive statistics, bivariate correlations (Pearson’s r), and intraclass correlations (ICC) of the peak factors derived from the PCA for the two components corresponding to the early late positive potential (LPP) and late LPP at each assessment/age

	T1 M(SD)	T2 M(SD)	T3 M(SD)	T1 to T2 r	T2 to T3 r	T1 to T3 r	T1 to T2 ICC	T2 to T3 ICC	T1 to T3 ICC	T1, T2, and T3 ICC
Early LPP
Unpleasant	−9.37 (10.69)	−11.05 (7.16)	−11.60 (6.39)	.30*	.52***	.50***	.27*	.52***	.43***	.39***
Pleasant	−12.28 (11.46)	−13.88 (7.79)	−15.68 (6.43)	.46***	.63***	.40***	.42***	.61***	.32**	.42***
Neutral	−13.12 (9.77)	−14.21 (6.33)	−14.99 (5.67)	.35**	.67***	.35**	.36**	.66***	.30**	.40***
Unpleasant residuals	0.00 (6.27)	0.00 (5.34)	0.00 (4.24)	.10	.26*	.29*	.10	.25*	.27*	.20**
Pleasant residuals	0.00 (6.61)	0.00 (5.20)	0.00 (3.95)	−.09	.21	−.001	−.09	.21	−.001	.01
Late LPP
Unpleasant	6.37 (9.62)	12.64 (6.92)	1.42 (6.45)	.24	.20	.22	.18*	.08	.17	.14**
Pleasant	3.61 (8.02)	11.03 (6.62)	−1.64 (5.56)	.20	−.11	.17	.13	−.04	.12	.05
Neutral	0.27 (11.30)	9.48 (5.97)	−1.45 (5.61)	.19	.04	.17	.11	.01	.13	.08*
Unpleasant residuals	0.00 (8.97)	0.00 (4.86)	0.00 (5.68)	.27*	.24	.14	.23*	.24*	.13	.19**
Pleasant residuals	0.00 (7.68)	0.00 (4.78)	0.00 (5.22)	.04	−.07	.11	.03	−.07	.10	.04

Note: T1 = age 9; T2 = age 12; T3 = age 15;

^***p < .001;

^**p < .01;

^*p < .05