Table 1.

Descriptive statistics: Electrophysiological and Temperament Indicators

	Minimum	Maximum	Mean	SD
F3 Baseline 5 monthsa	−.55	1.35	.65	.28
F4 Baseline 5 months	−.62	1.42	.69	.26
F3 Baseline 10 months	−.39	1.60	.91	.23
F4 Baseline 10 months	−1.16	1.58	.93	.25
F3 Baseline 24 months	−.22	1.55	1.05	.22
F4 Baseline 24 months	−.21	1.50	1.07	.19
F3 Baseline 36 months	.72	1.74	1.14	.19
F4 Baseline 36 months	.65	1.72	1.15	.20
F3 Baseline 48 months	.62	1.43	1.09	.14
F4 Baseline 48 months	.64	1.46	1.10	.13
F3 Baseline 72 months	.48	1.62	1.09	.18
F4 Baseline 72 months	.42	1.58	1.09	.18
P3 Baseline 5 monthsa	−.48	1.41	.80	.22
P4 Baseline 5 months	.06	1.39	.83	.21
P3 Baseline 10 months	−1.23	1.61	1.02	.23
P4 Baseline 10 months	.25	1.53	1.05	.19
P3 Baseline 24 months	−.11	1.51	1.10	.27
P4 Baseline 24 months	−.47	1.60	1.14	.26
P3 Baseline 36 months	.66	1.81	1.20	.21
P4 Baseline 36 months	.71	1.82	1.20	.21
P3 Baseline 48 months	.65	1.53	1.16	.17
P4 Baseline 48 months	.66	1.56	1.18	.17
P3 Baseline 72 months	.13	1.66	1.12	.23
P4 Baseline 72 months	.27	1.68	1.12	.22
Positive Affectivity/Surgencyb	2.77	6.68	4.73	.70
Negative Emotionality	1.54	5.30	3.00	.65
Regulatory Capacity/Orienting	3.57	6.60	5.04	.55
dftc 5 months	0	286	52.79	22.87
dft 10 months	0	99	51.02	18.02
dft 24 months	0	152	64.85	29.81
dft 36 months	24	264	143.78	53.67
dft 48 months	21	300	149.07	60.58
dft 72 months	18	294	191.98	37.71

Note.

^aPower expressed in terms of square microvolts, transformed using the natural log (ln).

^bTemperament scores reflect a 7-point Likert scale (1–7); summed and averaged items/scales yielding factors.

^cdft windows - artifact free usable EEG data, 2 windows per second.