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Table 1: Sample demographics and clinical characteristics^{^a}
Characteristics All PIB− PIB+ PIB− vs PIB+
No. (% women) 40 (48%) 24 (50%) 16 (44%) χ²₁ = 0.15, P = .70
Age (yr) 71 ± 5 70 ± 6 72 ± 4 t₃₈ = −1.19, P = .24
APOE ϵ4 carriers (%) 12 (31) 4 (17) 8 (53) χ²₁ = 5.83, P = .02
Body mass index (kg/m²) 27 ± 3 28 ± 3 26 ± 2 t₃₈ = 2.14, P = .04
Systolic blood pressure (mm Hg) 137 ± 15 138 ± 15 136 ± 15 t₃₈ = 0.31, P = .76
Diastolic blood pressure (mm Hg) 81 ± 8 80 ± 8 82 ± 9 t₃₈ = −0.65, P = .52
Total serum cholesterol level (mmol/L) 5.2 ± 1 4.9 ± 1 5.5 ± 1 t₃₈ = 1.69, P = .10
Education (yr) 9 (2) 9 (2.75) 8 (2) U = 158, P= .36
Physical activity ≥ twice per week (%) 63 52 80 χ²₁ = 3.02, P = .08
Mini-Mental State Examination 27 (2) 27 (2) 27 (3) U = 158, P = .35
Total composite z score 0.03 ± 0.5 0.06 ± 0.6 −0.01 ± 0.5 F_1,37 = 0.018, P = .90
Memory z score −0.05 ± 0.6 −0.10 ± 0.5 0.06 ± 0.7 F_1,37 = 2.42, P = .13
Executive function z score 0.04 ± 0.6 0.20 ± 0.6 −0.10 ± 0.4 F_1,37 = 1.94, P = .17
Processing speed z score 0.2 (0.9) 0.4 (1) 0.2 (1) F_1,37 = 0.03, P = .86
Dementia risk score 7.5 (3.75) 8 (3.75) 7 (2) U = 161, P = .39
Fazekas score 1 (2) 1 (2) 2 (1.75) U = 144, P = .18
↵a Data are given as mean ± SD or median (interquartile range).