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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)