Table 5.

Comparison of mean N1, P2, N2 and P3 latencies of 17 subjects with Down's syndrome and 34 controls.

Latency	Down's syndrome Mean Values	Control Group Mean Values	p - value
N1	104,5	99,2	0,0088*
P2	177,3	158,3	0,0032*
N2	288,0	207,0	0,0000*
P3	357,2	285,5	0,0000*

Mann-Whitney test