Table 1.
Characteristics of the study participants.
| Group 1 | Group 2* | Group 3* | |
|---|---|---|---|
| n = 107 | n = 89 | n = 18 | |
| Age at the baseline PET (years) | 67.9 ± 4.9 | 67.6 ± 5.1 | 69.3 ± 3.9 |
| Range | 56–81 | 56–81 | 62–76 |
| Age at the second PET (years) | 75.7 ± 4.8 | 75.4 ± 4.9 | 76.8 ± 3.9 |
| Range | 64–90 | 64–90 | 70–83 |
| MMSE at the second PET | 29.2 ± 1.1 | 29.2 ± 1.0 | 29.2 ± 1.3 |
| 25–30 | 26–30 | 25–30 | |
| Interval (years) | 7.8 ± 1.8 | 7.8 ± 1.8 | 7.6 ± 1.9 |
| Sex | |||
| Male | 19 | 14 | 5 |
| Female | 88 | 75 | 13 |
| Apolipoprotein E ε4 | |||
| Presence | 18 | 0 | 18 |
| Absence | 89 | 89 | 0 |
The data represent the mean ± standard deviation.
*Group 1 was divided into groups 2 and 3.
MMSE: Mini-Mental State Examination, PET: positron emission tomography.