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Table 3 Results for the test-retest investigation a

From: A computerized neuropsychological test battery designed for idiopathic normal pressure hydrocephalus

Computer test Test 1 N = 44 median (IQR) (Day 1) Retest N = 44 median (IQR) (Day 7 - 65) Difference, median (IQR) p SEm Reliability
Two choice reaction [ms] 737 (660 - 822) 735 (634 - 818) −16 (-62 - 28) 0.06b 51 0.75
Stroop congruent [ms] 846 (790 - 924) 841 (787 - 919) −3 (-53 - 23) 0.4c 56 0.74
Stroop incongruent [ms] 1073 (952 - 1371) 1021 (865 - 1258) −93 (-184 - 21) <0.01c 149 0.83
Ten word list e # 20 (17 - 22) 22.5 (19 - 24.25) 2 (0.5 - 3) <0.001b 2.1 0.67
Delayed recall e # 6 (5 - 8) 7 (4.75 - 8) 0 (-1 - 1) 0.78 c 1.2 0.74
Delayed recognition e # 9 (9 - 10) 9 (8 - 10) 0 (-1 - 1) 0.65 c 0.9 0.70
Trail making test A [s] 39.9 (36.0 - 48.8) 38.2 (33.5 - 44.7) −2.2 (-7.0 - 2.4) < 0.05c 6.5 0.87
Trail making test B [s] 78.2 (63.6 - 99.2) 74.7 (62.0 - 93.1) −5.9 (-14.5 - 2.7) < 0.05c 14.3 0.83
Figure copy task [%] 90.9f 81.8f N/A 0.22 d N/A 0.57
Four finger tapping e # 108 (97 -149) 123 (103 -173) 12 (3 - 22) <0.001c 15.8 0.90
  1. aIQR = Interquartile range; p = significance in score difference between test and retest; SEM = Standard Error of Measurement.
  2. bPaired t-test.
  3. cWilcoxon signed-rank test.
  4. dMcNemar test.
  5. eTests redesigned during the study and only 26 of the 44 participants in the reliability group took the slightly modified battery.
  6. fPercent who scored “correct”.