Table 4.

Pearson correlation coefficients between key neurophysiological variables (MMN peak amplitude at Fz, Cz, M1 and M2; P3a peak amplitude at Fz and Cz) and social functioning, quality of life, depressive and neuropsychological variables in bipolar-spectrum disorder and schizophrenia-spectrum disorder groups, n = 40

	MMN peak amplitude				P3a peak amplitude
Variable	Fz	Cz	M1	M2	Fz	Cz
Age	−0.12	−0.06	0.07	0.06	0.18	0.15
SOFAS	0.09	0.07	−0.02	0.06	−0.02	0.00
WHOQOL-BREF
Physical	0.22	−0.13	−0.31	−0.13	−0.19	−0.15
Psychological	0.42‡	0.24	−0.35†	−0.11	−0.17	−0.09
Social	0.12	−0.05	−0.38†	−0.20	−0.17	−0.13
Environmental	0.05	−0.05	−0.25	−0.08	−0.13	−0.09
HAM-D total	−0.35†	−0.24	0.24	−0.03	0.16	0.06
BPRS
Total	−0.17	−0.01	0.43†	0.04	0.23	0.26
Positive symptoms*	−0.10	0.04	0.40†	0.17	−0.05	0.02
Negative symptoms*	0.06	0.13	0.17	−0.06	−0.05	0.00
TMT A	0.23	0.17	−0.05	−0.08	0.03	0.09
TMT B	0.12	0.20	0.15	0.23	−0.08	−0.06
RAVLT A1–A5	−0.26	−0.14	0.01	0.01	−0.05	0.04
RAVLT A7	−0.13	−0.20	0.07	0.15	0.08	0.12

BPRS = Brief Psychiatric Rating Scale;³⁰ HAM-D = Hamilton Rating Scale for Depression;³¹ SOFAS = Social and Occupational Functioning Assessment Scale;³² TMT A and B = Trail–Making Test, part A or B;³⁹ RAVLT = Rey Auditory Verbal Learning Test;³⁹ WHOQOL-BREF = World Health Organization Quality of Life questionnaire.³⁴

^*Spearman Rho correlation coefficients were used to calculate psychotic symptom variables.

^†p < 0.01.

^‡p < 0.001