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Table 5 Correlation between duration of illness and cognitive and executive functions

From: Evaluation of cognitive impairment in patients with major depressive disorder in remission

 

r

P

Visual memory

 Figural memory

− 0.35

< 0.001 (HS)

 Visual paired associates

0.12

> 0.05 (NS)

Verbal memory

 Logical memory

− 0.1

> 0.05 (NS)

 Verbal paired associates

0.04

> 0.05(NS)

Attention/concentration

 Mental control

− 0.019

> 0.05(NS)

 Digit span

− 0.16

> 0.05(NS)

Visuospatial function

 Visual reproduction

− 0.05

> 0.05(NS)

Wisconsin card sorting test

 Trial administered (conceptualization)

0.04

> 0.05(NS)

 Categories completed (abstract ability)

− 0.28

< 0.05(S)

 Perseverative errors (cognitive flexibility)

− 0.06

> 0.05(NS)

 Failure to maintain set (sustained attention)

− 0.18

> 0.05(NS)

  1. There were statistically non-significant correlations between duration of illness and different subsets of Wechsler memory scale (p > 0.05), except for figural memory (a subtest of visual memory ) which exhibited statistically a high significant correlation with duration of illness (p < 0.001) though this negative linear relationship was weak (r = − 0.35). Also, there were non-significant correlations between duration of illness and executive functions assessed by Wisconsin card sorting test (p > 0.05), except for categories completed (reflecting abstract thinking) which exhibited statistically a significant correlation with duration of illness (p < 0.05) though this negative linear relationship was weak (r = − 0.28)