Table 3. Correlations between questionnaires and cognitive tests.

	MG-QOL		BDI		Epworth
	p-value	r	p-value	r	p-value	r
Age	0.306 2	-	0.157 2	-	0.328 2	-
Education	0.352 2	-	0.609 2	-	0.313 2	-
Length of illness	0.114 2	-	0.776 2	-	0.967 2	-
MMSE	0.101 2	-	0.001	-0.551 2	0.582 2	-
MoCA	0.628 2	-	0.155 2	-	0.678 2	-
PVF	0.995 2	-	0.253 2	-	0.822 2	-
SVF	0.609 2	-	0.157 2	-	0.571 2	-
A1-A5	0.796 2	-	0.218 2	-	0.675 2	-
A6	0.048	0.777 2	0.617 2	-	0.162 2	-
A7	0.333 2		0.713 2	-	0.111 2	-
MG-QOL	-	-	0.007	0.449 2	0.491 2	-
MGCS	<0.001	0.775 2	0.054 2	-	0.085 2	-
BDI	0.007	0.449 2	-	-	0.089 2	-
Epworth	0.491 2	-	0.089 2	-	-	-

MMSE: Mini-Mental State Examination; MoCA: Montreal Cognitive Assessment ; PVF: phonemic verbal fluency; SVF: semantic verbal fluency; A1-A5: immediate memory; A6: short term memory retention; A7: recent memory; BDI: Beck Depression Inventory; MG-QOL: Myasthenia Gravis - quality of life scale; MGCS: Myasthenia Gravis Composite Scale; ¹ Spearman's correlation; ² Pearson correlation.