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Table 4 Test-retest reliability and group mean (standard deviation) of each clinical group over a four month assessment period

From: Clinical utility of the cogstate brief battery in identifying cognitive impairment in mild cognitive impairment and Alzheimer’s disease

     Month 1 Month 2 Month 3 Month 4
  Composite ICC (95% CI) p Mean SD Mean SD Mean SD Mean SD
Overall Attention 0.90 (0.87, 0.92) <.0001 96.46 11.97 95.79 15.65 95.66 11.79 97.37 23.16
  Memory 0.95 (0.93, 0.96) <.0001 93.03 14.09 94.16 13.3 95.17 14.6 96.39 14.76
HC Attention 0.94 (0.92, 0.96) <.0001 100 8.86 98.86 9.08 99.26 8.81 101.27 27.59
  Memory 0.78 (0.70, 0.85) <.0001 99.92 8.05 100.73 8.37 102.61 8.86 104.57 7.39
MCI Attention 0.94 (0.90, 0.97) <.0001 95.69 11.73 93.66 11.6 93.9 12.53 95.42 11.33
  Memory 0.86 (0.78, 0.92) <.0001 92.18 10.99 92.16 9.51 92.53 11.03 93.89 10.02
AD Attention 0.77 (0.58, 0.89) <.0001 86.76 14.83 88.96 28.53 86.56 13.8 88.04 14.65
  Memory 0.91 (0.84, 0.96) <.0001 73.4 13.07 75.95 12.26 75.1 13.11 75.16 13.46
  1. Note: ICC = Intra-class correlation coefficient; HC = healthy controls; MCI = mild cognitive impairment; AD = Alzheimer’s disease; Attention/psychomotor composite = average of the standardized Detection and Identification scores; Learning/working memory composite = average of the standardized One Card Learning and One Back scores.