Mismatch negativity as an early biomarker of cognitive impairment in schizophrenia

Table 3 Correlations between MMN parameters and each of the age, duration of illness and the studied psychometric scales in the right and left ears among early schizophrenics

	Early schizophrenic subgroup (IIa)
	Age	Duration of illness	TMT	MMSE	DS	Dsy
Right tone amplitude
r	0.278	0.129	0.383	− 0.775	− 0.626	0.381
P	0.335	0.661	0.176	0.001*	0.017*	0.179
Right tone latency
r	0.094	0.105	0.193	0.331	0.059	0.017
P	0.750	0.721	0.510	0.247	0.842	0.955
Right speech amplitude
r	0.072	0.490	0.240	− 0.613	− 0.689	− 0.434
P	0.806	0.075	0.409	0.020*	0.006*	0.121
Right speech latency
r	0.190	− 0.304	− 0.102	0.775	0.613	0.342
P	0.516	0.290	0.727	0.001*	0.020*	0.232
Left tone amplitude
r	− 0.305	− 0.038	− 0.134	− 0.775	− 0.626	0.387
P	0.290	0.898	0.648	0.001*	0.017*	0.171
Left tone latency
r	0.272	− 0.371	− 0.068	0.775	0.677	− 0.515
P	0.433	0.191	0.819	0.001*	0.008*	0.059
Left speech amplitude
r	0.073	0.090	− 0.315	− 0.613	− 0.648	0.105
P	0.803	0.759	0.272	0.020*	0.012*	0.721
Left speech latency
r	0.355	− 0.277	0.151	0.775	0.685	0.190
P	0.449	0.337	0.607	0.001*	0.007*	0.516

TMT trail making test, MMSE Mini-Mental state examination, DS Digit span scale, Dsy Digit symbol scale, r Pearson correlation coefficient
*Statistically significant