Table 1.

Participant characteristics (percentage in parentheses; n = 1637)

Age in years, mean ± SD	69.83 ± 8.66
Gender, n males/females	624/1013
Education in years, mean ± SD	12.79 ± 4.19
ApoE-ε2, n	233 (14.2)
ApoE-ε4, n	488 (29.8)
Diabetes, n	120 (7.3)
Head injury, n	224 (13.7)
Cardiovascular disease burden, mean ± SD	0.29 ± 0.61
Smoking, n	234 (14.3)
Cerebrovascular disease, n	105 (6.4)
Odor identification, proportion correct mean ± SD	0.77 ± 0.17
Vocabulary test, mean ± SD	23.73 ± 4.35
MMSE at baseline, mean ± SD	29.27 ± 0.83
MMSE at 6-year follow-up, mean ± SD	27.92 ± 2.82