Sleep disturbances and psychomotor retardation in the prediction of cognitive impairments in patients with major depressive disorder

Table 1 Demographic and clinical characteristics of patients with major depressive disorder, mean (SD)

Characteristics	MDD (n = 162)
Age (years)	35.1 (9.55)
Male/female	72/90
Education (years)	10.45 (3.41)
Age of onset (years)	31.94 (9.71)
Number of episodes (n)	2.15 (1.51)
Total illness duration (months)	40.36 (50.64)
HAM-D score	31.56 (7.28)
Retardation	8.08 (2.94)
Cognitive disturbances	4.73 (2.32)
Sleep disturbances	4.13 (1.98)
Anxiety/somatization	6.44 (2.31)
Weight loss	0.86 (0.79)
Diurnal variation	1.07 (0.82)
Hopelessness	6.25 (2.26)
HAM-A score	18.33 (6.31)
Psychic anxiety symptoms	12.47 (3.52)
Somatic anxiety symptoms	5.76 (3.49)

MDD: Major depressive disorder.