Table 2 Correlation matrix of key variables. This table displays full correlation coefficients below the diagonal and partial correlation coefficients above the diagonal, with the latter controlling for age and years of education.

	UCLA_L	MMSE	DS_F	DS_B	VF_A	VF_T	VOC	SIM	SymSub	SymSea	CTT-A	CTT-B	GDS
UCLA_L		−0.18*	−0.27*	−0.12	−0.07	−0.08	−0.23**	−0.24**	−0.21**	−0.06	0.27**	0.30**	0.56**
MMSE	−0.25**		0.21*	0.37**	0.33**	0.50**	0.34**	0.41**	0.46**	0.39**	−0.44**	−0.29**	−0.21**
DS_F	−0.33**	0.49**		0.42**	0.04	0.11	0.38**	0.17*	0.25**	0.21*	−0.24**	−0.19*	−0.16*
DS_B	−0.22**	0.62**	0.62**		0.26**	0.36**	0.25**	0.18*	0.36**	0.45**	−0.26**	−0.28**	−0.12
VF_A	−0.15	0.55**	0.29**	0.47**		0.79**	0.18*	0.22**	0.38**	0.35**	−0.21**	−0.21**	−0.17*
VF_T	−0.19*	0.70**	0.41**	0.60**	0.84**		0.29**	0.39**	0.49**	0.40**	−0.29**	−0.26**	−0.25**
VOC	−0.29**	0.58**	0.61**	0.55**	0.39**	0.54**		0.50**	0.23**	0.16	−0.28**	−0.19*	−0.21**
SIM	−0.31**	0.64**	0.47**	0.50**	0.43**	0.60**	0.69**		0.23**	0.15	−0.19*	−0.22**	−0.30**
SymSub	−0.29**	0.74**	0.59**	0.67**	0.57**	0.71**	0.63**	0.60**		0.65**	−0.41**	−0.37**	−0.16*
SymSea	−0.19*	0.70**	0.55**	0.70**	0.55**	0.65**	0.57**	0.53**	0.86**		−0.24**	−0.27**	−0.15
CTT-A	0.33**	−0.69**	−0.51**	−0.55**	−0.45**	−0.56**	−0.55**	−0.51**	−0.70**	−0.61**		0.63**	0.19*
CTT-B	0.35**	−0.63**	−0.49**	−0.57**	−0.45**	−0.55**	−0.51**	−0.53**	−0.69**	−0.63**	0.79**		0.18*
GDS	0.57**	−0.29**	−0.26**	−0.23**	−0.24**	−0.32**	−0.31**	−0.36**	−0.28**	−0.28**	0.27**	0.27**

UCLA_L the UCLA Loneliness Scale, MMSE Mini-Mental State Examination, DS_F the forward digit span, DS_B the backward digit span, VF_A the verbal fluency test (animals), VF_T, the verbal fluency test (total), VOC the vocabulary test, SIM the similarity test, SymSub the symbol substitution test, SymSea the symbol search test, CTT-A Part A of the color trails test, CTT-B Part B of the color trails test, GDS the Geriatric Depression Scale. **p < 0.01; *p < 0.05.

Search