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Table 2 Sample characteristics

From: White matter microstructure is altered in cognitively normal middle-aged APOE-ε4 homozygotes

  Total sample (N = 532) NC (n = 257) HE (n = 207) HO (n = 68) Inferential statistics
  Mean SD Mean SD Mean SD Mean SD  
Age, years 58.13 7.46 58.52 7.62 58.71 7.41 54.94 6.22 F = 7.37; p < 0.01
Education, years 13.61 3.54 13.61 3.60 13.59 3.52 13.38 3.48 F = 0.19; p = 0.83
MMSE score 29.06 1.05 29.00 1.12 29.02 1.11 29.26 0.78 F = 1.45; p = 0.24
TFRa 16.46 5.16 16.32 5.20 16.24 5.09 17.73 5.16 F = 2.25; p = 0.11
TPRa 24.13 4.48 23.83 4.85 24.16 4.19 25.19 3.71 F = 2.36; p = 0.10
Males/females, n 211/321 92/165 94/113 25/43 χ2 = 4.79; p = 0.09
  1. Abbreviations: NC Noncarriers; HE ε4-Heterozygous; HO ε4-Homozygous; MMSE Mini Mental State Examination; TPR Total paired recall; TFR Total free recall
  2. aFull evaluation of cognitive performance was not available for 16 subjects