Table 1.
Participant demographic characteristics of cognitively unimpaired participants and participants with MCIa or mild ADb.
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Group | Statistical values | |||||||||
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Cognitively unimpaired (n=78) | MCI or mild AD (n=73) | Test statistic | P value | |||||||
| Sex, n (%) | χ21=0.3 | .61 | |||||||||
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Female | 47 (60) | 41 (56) |
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Male | 31 (40) | 32 (44) |
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|
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| Country of residence, n (%) | χ21=4.7 | .03 | |||||||||
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United Kingdom | 66 (85) | 51 (70) |
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|
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United States | 12 (15) | 22 (30) |
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|
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| Testing schedule, n (%) | χ21=7.0 | .008 | |||||||||
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Schedule 1 | 40 (51) | 22 (30) |
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|
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Schedule 2 | 38 (49) | 51 (70) |
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|
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| Amyloid beta status, n (%) | χ21=0.8 | .36 | |||||||||
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Amyloid negative | 38 (49) | 41 (56) |
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|
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Amyloid positive | 40 (51) | 32 (44) |
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|
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| Years of education, mean (SD) | 15.24 (3.37) | 15.06 (2.80) | r=−0.05 | .57 | |||||||
| Age (years), mean (SD) | 70.37 (4.35) | 69.58 (7.30) | r=−0.01 | .91 | |||||||
| MMSEc, mean (SD) | 28.92 (1.15) | 27.00 (2.07) | r=0.50 | <.001 | |||||||
aMCI: mild cognitive impairment.
bAD: Alzheimer disease.
cMMSE: Mini-Mental State Examination.