Table 1.

Sample characteristics of participants from the Baltimore Longitudinal Study of Aging with a diagnosis of AD

N Subjects	165
Total N Assessments	988
Number of Visits per Subject, Mean (S.D.), Range	6.0 (4.3), 1–22
Female, n (%)	83 (50.3)
White, n (%)	141 (85.5)
Baseline Age, Mean (S.D.), Range	76.5 (7.4), 61.1–91.2
Education (y), Mean (S.D.), Range	16.7 (2.6), 8 –21
Age at MCI Onset, Mean (S.D.), Range	84.0(6.1), 65–98
Age at AD Diagnosis, Mean (S.D.), Range	86.5 (6.1), 65– 102
Time to AD Diagnosis, Mean (S.D.), Range	10.0 (6.5), 0–22.9
Follow up Interval (y), Mean (S.D.), Range	8.3 (6.0), 0–24.1
Years between MCI onset and AD diagnosis, Mean (S.D.), Range	2.5 (1.8), 0–10