Table 5.

Spearman’s nonparametric correlations for clinical variables and PC loadings. Notes: Text in bold- italics indicates statistically significant relationship; PC = principal component; MoCA = Montreal Cognitive Assessment; Rey-O = Rey-Osterrieth Complex Figure test; BNT = Boston Naming Test, short form; FAB = Frontal Assessment Battery; FBI = Frontal Behavioural Inventory; MDS-UPDRS III = the Movement Disorders Society-sponsored version of the Unified Parkinson’s Disease Rating Scale, motor subsection; TMT B = Trail Making Test B; TT = Token Test. PiB = global Pittsburgh Compound B (PiB) ratio; WAB AQ = Western Aphasia Battery Aphasia Quotient; PPTT = The Pyramids and Palm Trees Test; NPI-Q = Neuropsychiatric Inventory Questionnaire; TMT A= Trail Making Test; AVLT = Auditory Verbal Learning Test; ST = Short-term retention; LT = Long-term retention.

Clinical Variable	PC 1	PC 2	PC 3
MoCA	0.5986, p = 0.0237	0.3623, p = 0.2030	−0.5086, p = 0.0633
Rey-O	0.7030, p = 0.0035	−0.2047, p = .4642	−0.0670, p = 0.8124
BNT	0.8239, p = 0.0005	−0.1387, p = 0.6513	−0.2663, p = 0.3791
FAB	0.4324, p = 0.1074	0.6955, p = 0.0040	−0.1081, p = 0.7013
FBI	−0.3454, p = 0.2264	−0.5963, p = 0.0244	0.2222, p = 0.4451
MDS-UPDRS III	−0.0528, p = 0.8517	−0.6632, p = 0.0070	0.2569, p = 0.3554
TMTB	−0.0186, p = 0.9594	0.6441, p = 0.044	−0.6751, p = 0.0322
TT	0.4509, p = 0.1220	0.2490, p = 0.4121	−0.7414, p = 0.0037
Age	−0.2536, p = 0.3618	−0.1107, p = 0.6945	0.1571, p = 0.5760
Disease Duration	0.1451, p = 0.6059	−0.1523, p = 0.5878	−0.1850, p = 0.5093
PiB	−0.3106, p = 0.2798	0.3678, p = 0.1957	0.3987, p = 0.1579
WAB AQ	0.2879, p = 0.3182	0.3363, p = 0.2398	−0.4462, p = 0.1098
PPTT	0.3925, p = 0.1651	−0.0772, p = 0.7931	−0.0353, p = 0.9047
NPI-Q	−0.3376, p = 0.2185	−0.1595, p = 0.5701	−0.4415, p = 0.0995
TMTA	0.4009, p = 0.1554	0.2740, p = 0.3432	−0.1314, p = 0.6543
AVLT ST	0.5476, p = 0.0527	−0.0196, p = 0.9494	−0.1481, p = 0.6293
AVLT LT	0.5298, p = 0.0626	−0.1914, p = 0.5310	−0.0832, p = 0.7869