Table 2.

Spearman's rank correlation (ρ) between cognitive-executive measures and SCL-90-R psychiatric symptoms, adjusted for age and/or year of education (whenever appropriate).

	MR SS #		DS forwards #		DS backwards		Stroop		TMT B-A γ		SDMT γ
	ρ	p-value	ρ	p-value	ρ	p-value	ρ	p-value	ρ	p-value	ρ	p-value
Somatization	−0.06	0.715	0.00	0.999	−0.10	0.500	−0.29	0.050	−0.24	0.125	−0.02	0.895
Depression	−0.25	0.093	0.08	0.594	0.08	0.604	−0.37	0.036*	−0.04	0.811	−0.09	0.582
Interpersonal	−0.22	0.155	−0.03	0.848	0.05	0.728	−0.20	0.183	−0.12	0.473	−0.06	0.723
Phobic anxiety	−0.05	0.723	−0.08	0.611	−0.18	0.241	−0.23	0.129	−0.01	0.998	−0.07	0.671
Paranoid ideation	−0.19	0.210	0.04	0.817	−0.06	0.690	−0.19	0.220	−0.08	0.629	−0.02	0.878
Obsessive-compulsive	−0.20	0.195	0.16	0.306	−0.04	0.786	−0.19	221	−0.14	0.420	−0.01	0.997
Hostility	−0.43	0.003*	0.10	0.504	−0.21	0.159	−0.30	0.046*	−0.14	0.396	−0.02	0.916
Anxiety	−0.20	0.179	0.01	0.970	−0.23	0.135	−0.31	0.041*	−0.10	0.521	−0.05	0.768
Psychoticism	−0.19	0.222	0.09	0.540	0.01	0.939	−0.16	0.286	−0.05	0.744	−0.01	0.971
Global Severity Index	−0.28	0.065	0.02	0.973	0.03	0.831	−0.34	0.019*	−0.15	0.362	−0.06	0.727

*p-values remain α = 0.05 after adjustment using the Holm-Bonferroni family-wise false discovery rate (FWFDR) correction method. Bolded p-values indicate that correlation is significant after FWFDR correction.

^#corrected for years of education.

^γcorrected for age and years of education.

Note there were significant correlations between Stroop Color-Word T Score and both ICARS (ρ = −0.503, p = 0.001) and UPDRS (ρ = −0.436, p = 0.003), after adjusting for age.

MR SS, WAIS-III Matrix Reasoning Scaled Score; DS Forwards, WAIS-III forwards digit span subtotal; DS Backwards, WAIS-III backwards digit span subtotal; Stroop, Stroop Color-Word T Score; TMT B-A, Trail-Making Test time difference between B and A; SDMT, Symbol-Digit Modalities Test.