Table 3.

Correlations between demographic and clinical variables with WM tests (Digit span forward, Digits span backward, Short-delay CPT-AX test, Long-delay CPT-AX test and N-back test).

	Working memory tests
	Digit Span Forward	Digit Span Backward	Short-delay CPT-AX	Long-delay CPT-AX	N-back
Age	r = 0.04	r = −0.03	r = 0.06	r = 0.01	r = −0.05
	p = 0.56	p = 0.80	p = 0.59	p = 0.91	p = 0.66
Number of completed years of education	r = −0.08	r = 0.06	r = 0.04	r = 0.02	r = −0.01
	p = 0.45	p = 0.45	p = 0.56	p = 0.82	p = 0.91
Premorbid IQ	r = 0.03	r = 0.05	r = 0.02	r = −0.09	r = −0.07
	p = 0.79	p = 0.64	p = 0.82	p = 0.41	p = 0.54
Disease duration	r = 0.04	r = −0.08	r = −0.06	r = −0.14	r = 0.17
	p = 0.75	p = 0.53	p = 0.61	p = 0.27	p = 0.17
CPZ equivalent dosage	r = −0.131	r = −0.125	r = 0.091	r = 0.561	r = 0.458
	p = 0.29	p = 0.32	p = 0.46	p < 0.0001	p < 0.0001

r, Spearman's correlation coefficient, p-value- two-tailed.

Significant correlations (p < 0.05) were marked in bold.