Table 2.

The discriminant analysis results of the ERPs components.

Variables	Three groups		Two groups
	Standardized canonical coefficients		Standardized canonical coefficients
	Function 1	Function 2	Function 1
Square root of number of segments in ERP	0.868	−0.107	0.741
Peak-to-peak amplitude difference of P2 for 1 kHz between loud and soft auditory stimuli at Fz	−0.156	0.617	0.096
Peak-to-peak amplitude difference of P2 for 3 kHz between loud and soft auditory stimuli at Fz	−0.296	−0.314	−0.772
Peak-to-peak amplitude difference of P3 for 1 kHz between loud and soft auditory stimuli at Fz	0.588	0.244	0.807
Peak-to-peak amplitude difference of P3 for 3 kHz between loud and soft auditory stimuli at Fz	0.498	−0.119	0.918
Peak-to-peak amplitude difference of P2 for 1 kHz between loud and soft auditory stimuli at Pz	0.108	−0.523	−0.301
Peak-to-peak amplitude difference of P2 for 3 kHz between loud and soft auditory stimuli at Pz	−0.241	0.670	0.024
Peak-to-peak amplitude difference of P3 for 1 kHz between loud and soft auditory stimuli at Pz	0.223	−0.244	0.248
Peak-to-peak amplitude difference of P3 for 3 kHz between loud and soft auditory stimuli at Pz	0.185	0.382	0.087
Peak latency difference of P2 for 1 kHz between loud and soft auditory stimuli at Fz	−0.032	−0.273	−0.213
Peak latency difference of P2 for 3 kHz betweenloud and soft auditory stimuli at Fz	0.650	0.062	0.726
Peak latency difference of P3 for 1 kHz between loud and soft auditory stimuli at Fz	0.245	0.083	0.253
Peak latency difference of P3 for 3 kHz between loud and soft auditory stimuli at Fz	0.487	0.816	0.773
Peak latency difference of P2 for 1 kHz between loud and soft auditory stimuli at Pz	−0.059	−0.016	−0.438
Peak latency difference of P2 for 3 kHz between loud and soft auditory stimuli at Pz	−0.289	0.473	−0.330
Peak latency difference of P3 for 1 kHz between loud and soft auditory stimuli at Pz	−0.256	−0.298	−0.396
Peak latency difference of P3 for 3 kHz between loud and soft auditory stimuli at Pz	−0.207	−0.382	0.087