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Table 1 Demographic and clinical characteristics for each clinical group

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

  HC (n = 659) MCI (n = 107) AD (n = 51)
  Mean (SD) Mean (SD) Mean (SD)
Percentage females+ 57.8% 50.5% 51.0%
Age (years) 69.5 (6.6) 75.7 (7.5) 79.3 (7.2)
MMSE 28.7 (1.4) 26.1 (2.1) 19.8 (3.8)
CDR-SB 0.06 (0.3) 1.39 (1.2) 5.87 (2.4)
Premorbid IQ 108.35 (7.3) 105.9 (9.0) 103.2 (8.4)
Education level med 12 (9–15) 12 (9–15) 12 (9–15)
HADS depression 2.6 (2.2) 3.3 (2.4) 3.8 (3.1)
HADS anxiety 4.3 (2.9) 4.1 (2.6) 4.7 (3.7)
Detection speed* 100.0 (10.0) 94.26 (13.7) 91.72 (13.5)
Identification speed* 100.0 (10.0) 87.62 (16.4) 84.12 (15.4)
One card learning accuracy* 100.0 (10.0) 83.74 (11.6) 78.42 (15.1)
One back accuracy* 100.0 (10.0) 79.18 (13.1) 70.14 (16.3)
  1. Note: + = percentage of clinical group, med = median (range), * = mean score =100 and SD score = 10 because the mean and SD of the controls was used to standardize the data for each individuals performance on each cognitive task. One way ANOVAs indicated significant differences between groups on age, premorbid IQ, and depressive symptoms, all p’s < 0.001. MMSE = Mini Mental State Examination; CDR-SB = Clinical Dementia Rating Scale, Sum of Boxes Score; HADS = Hospital Anxiety and Depression Scale.