Table 1.

Means and standard deviations for auditory P1 latencies (ms) and amplitudes (μV) at midline sites by age-group (years).

		4–5 years				6–7 years				8–9 years				10–12 years
		Amplitude		Latency		Amplitude		Latency		Amplitude		Latency		Amplitude		Latency
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Fz	Infrequent	6.29	4.7	95.6	13.6	8.54	4.7	92.0	16.3	7.32	3.4	87.3	13.9	3.48	2.7	78.6	10.1
	Novel	8.13	6.9	96.5	12.2	9.34	5.3	91.4	14.1	7.50	6.0	84.3	12.0	5.93	4.2	77.4	6.9
	Frequent	7.77	5.3	97.4	12.9	9.22	5.2	97.8	13.7	7.49	4.6	99.0	22.4	3.82	3.2	86.2	15.1
FCz	Infrequent	7.10	5.6	96.5	14.0	8.40	4.6	93.4	17.2	7.14	3.7	87.8	14.8	2.85	2.5	78.4	10.2
	Novel	9.63	6.0	99.3	11.7	9.25	5.5	92.8	13.2	7.33	6.0	83.6	11.4	5.29	3.4	76.8	6.8
	Frequent	7.57	5.6	96.8	13.5	8.71	5.2	99.1	15.5	7.60	4.4	102.7	22.7	3.01	2.6	86.2	15.6
Cz	Infrequent	6.20	5.5	95.7	14.0	7.30	4.6	94.3	18.0	6.06	4.0	88.2	18.1	1.82	2.5	85.0	17.4
	Novel	8.62	5.2	98.9	12.1	8.26	5.6	92.8	15.3	6.19	5.5	83.1	12.0	4.05	3.5	76.2	6.5
	Frequent	6.38	5.3	97.3	13.9	7.56	4.7	99.1	16.5	6.20	3.9	100.0	24.7	2.20	1.9	86.6	16.1
Pz	Infrequent	3.10	3.7	89.6	15.8	3.65	4.1	93.1	20.6	3.04	3.7	92.1	20.4	−0.10	2.2	80.4	15.3
	Novel	3.26	4.6	89.4	15.3	3.96	4.2	91.2	19.0	2.67	4.2	87.2	18.8	0.76	2.6	74.2	5.4
	Frequent	3.53	5.1	92.7	16.9	3.57	3.8	97.0	22.3	2.45	3.7	100.2	27.4	0.09	2.4	86.6	15.1