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Table 1 Results and descriptive statistics of the five cognitive tests

From: Low-grade impairments in cognitive and kidney function in a healthy middle-aged general population: a cross-sectional study

The number of observations (%), range of test scores and median scores (interquartile range) on the five different cognitive tests

 

N (%)

Range of possible test score

Median (interquartile range)

Test domain

The Digit Symbol Substitution testa

1170 (71.9)

0 to 96 possible symbols decoded

45 (38 to 53)

Executive function

The finger tapping testb

1137 (69.9)

0 to 70 taps per 10 s

55 (48.6 to 60.3)

Motor speed

MMSEc

966 (59.4)

0 to 30 points, where 30 is best

29 (28 to 29)

Cognitive function

The 12 word test pt 1d

1178 (72.4)

0 to 12 points, where 12 is best

7 (6 to 8)

Verbal episodic memory

The 12 word test pt 2e

1174 (72.2)

0 to 24 points, where 24 is best

20 (18 to 22)

Verbal episodic memory

  1. aIn the Digit Symbol Substitution Test, participants are asked to fill in as many correct symbols as possible in 90 s
  2. bIn the finger tapping test, participants are asked to tap with their index finger on the keyboard as fast as possible in 10 s and to repeat this process four times with each hand
  3. cMMSE indicating Mini-Mental State Examination. In the MMSE, a global cognitive function test, participants are asked to answer several questions and complete different tasks
  4. d,ePart 1 and 2 of the 12-word test are tests of immediate and cued recall of words