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Table 1 Demographic data, cognitive tests, and the number of ApoE ε4 alleles of the selected ADNI subjects separated by diagnosis group

From: Data analysis with Shapley values for automatic subject selection in Alzheimer’s disease data sets using interpretable machine learning

Variable sMCI pMCI Σ p value
n 400 319 719  
Age (in years) 73.2 ±7.5 74.0 ±7.1 73.6 ±7.3 0.1281
Gender (proportion of females) 40.3% 40.1% 40.2% 1.0000
Gender (proportion of males) 59.8% 59.9% 59.8%  
MMSE 27.8 ±1.8 27.0 ±1.7 27.4 ±1.8 <0.0001
CDR 0.5 ±0.0 0.5 ±0.0 0.5 ±0.0 0.2640
ApoE ε4 (proportion of subjects with 0 alleles) 56.8% 34.2% 46.7% <0.0001
ApoE ε4 (proportion of subjects with 1 allele) 34.0% 49.5% 40.9%  
ApoE ε4 (proportion of subjects with 2 alleles) 9.3% 16.3% 12.4%  
Time to final diagnosis in months 47.3 ±32.6 30.6 ±24.7 39.8 ±30.4 <0.0001
  1. For continuous features, mean and standard deviation are given. p value are calculated using Mann-Whitney U test [49, 50] for continuous features and using χ2-test for ordinal and nominal features