Table 1.

Comparison of matched groups variables according to the Hamilton Depression Rating Scale.

	Non-depression	Moderate depression	Severe depression	ND vs. MD	MD vs. SD
	(n = 46)	(n = 46)	(n = 46)	p	p
Age (years), mean (standard deviation)	46.5 (14.5)	46.2 (14.4)	45.8 (13.6)	0.91	0.87
Female sex, number (%)	33 (71.7%)	33 (71.7%)	33 (71.7%)	1.0	1.0
Education (years), mean (standard deviation)	9.7 (4.8)	9.1 (3.4)	8.8 (4.3)	0.37	0.32
Mini-mental status examination (score), mean (standard deviation)	28.1 (2.1)	27.9 (1.7)	27.4 (2.5)	0.47	0.21
Hamilton depression rating scale (score), mean (standard deviation)	2.5 (1.4)	19.7 (2.1)	28.9 (3.7)	<0.001	<0.001

ND, Non-depressed group; MD, Moderately depressed group; SD, Severely depressed group; p, proof value.