Table 4.

Correlations between clinical ratings and WM tests (Digit span forward, Digits span backward, Short-delay CPT-AX test, Long-delay CPT-AX test and N-back test) with respect to diagnostic groups.

		Working memory tests
		Digit span forward	Digit span backward	Short-delay CPT-AX	Long-delay CPT-AX	N-back
BPD(−)	Depressive symptoms (HDRS)	r = 0.015	r = −0.463	r = −0.536	r = −0.535	r = −0.528
		p = 0.944	p = 0.023	p = 0.088	p = 0.007	p = 0.008
	Manic symptoms (YMRS)	r = −0.232	r = −0.144	r = −0.053	r = −0.244	r = 0.370
		p = 0.276	p = 0.501	p = 0.807	p = 0.251	p = 0.076
BPD(+)	Depressive symptoms (HDRS)	r = 0.273	r = 0.134	r = 0.183	r = −0.758	r = −0.584
		p = 0.258	p = 0.583	p = 0.453	p<0.001	p = 0.009
	Manic symptoms (YMRS)	r = 0.105	r = 0–0.356	r = 0.17	r = 0.312	r = 0.117
		p = 0.668	p = 0.134	p = 0.944	p = 0.251	p = 0.632
SZ	Negative symptoms (PANSS)	r = 0.012	r = 0.158	r = −0.076	r = −0.454	r = −0.633
		p = 0.958	p = 0.472	p = 0.732	p = 0.029	p = 0.001

SZ, schizophrenia; BPD(−), bipolar disorder without history of psychosis; BPD(+), bipolar disorder with history of psychosis; PANSS, Positive and Negative Symptoms Scale; YMRS, Young Mania Rating Scale; HDRS, Hamilton Depression Rating Scale; r, Spearman's correlation coefficient, p-value- two-tailed.

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