Mismatch negativity as an early biomarker of cognitive impairment in schizophrenia

Table 4 Correlations between MMN parameters and each of the age, duration of illness and the studied psychometric scales in the right and left ears among chronic schizophrenics

Chronic schizophrenic subgroup (IIb)
	Age	Duration of illness	TMT	MMSE	DS	Dsy
Right tone amplitude
r	0.310	− 0.932	0.154	− 0.652	− 0.626	− 0.595
P	0.243	0.002*	0.569	0.006*	0.017*	0.015*
Right tone latency
r	0.509	0.974	0.775	0.556	0.588	0.652
P	0.044	0.001*	0.001*	0.025*	0.035*	0.006*
Right speech amplitude
r	0.018	− 0.653	− 0.176	− 0.652	− 0.626	− 0.595
P	0.954	0.006*	0.566	0.006*	0.017*	0.015*
Right speech latency
r	− 0.304	0.499	0.652	0.775	0.775	0.677
P	0.313	0.009*	0.006*	0.001*	0.001*	0.008*
Left tone amplitude
r	0.378	− 0.572	− 0.046	− 0.652	− 0.775	− 0.626
P	0.165	0.033*	0.872	0.006*	0.001*	0.017*
Left tone latency
r	0.224	0.535	0.630	0.556	0.775	0.685
P	0.404	0.049*	0.016*	0.025*	0.001*	0.007*
Left speech amplitude
r	0.335	− 0.658	0.174	− 0.775	− 0.626	− 0.630
P	0.264	0.009*	0.569	0.001*	0.017*	0.016*
Left speech latency
r	0.121	0.400	0.775	0.556	0.588	0.652
P	0.694	0.198	0.001*	0.025*	0.035*	0.006*

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