Observed Probabilities of Amyloid Positivity on PET Across Diagnostic and Age Groups
| Parameter | Total (n = 1,193) | AD (n = 960) | FTD (n = 36) | MCI (n = 144) | DLB (n = 5) | CBS (n = 4) | VaD (n = 29) | UN-D (n = 15) |
| Total | 860 (72.1) | 833 (86.8) | 2 (5.6) | 14 (9.7) | 3 (60.0) | 2 (50.0) | 6 (20.7) | 0 |
| Age group | ||||||||
| <40 y | 12/18 (66.7) | 12/13 (92.3) | 0/1 | 0/1 | 0 | 0 | 0 | 0/5 |
| 40–49 y | 32/64 (50.0) | 32/39 (82.1) | 0/6 | 0/16 | 0 | 0 | 0 | 0/3 |
| 50–59 y | 221/300 (73.7) | 213/241 (88.4) | 1/9 (11.1) | 6/43 (14.0) | 0 | 0/1 | 1/4 (25.0) | 0/2 |
| 60–69 y | 286/395 (72.4) | 275/316 (87.0) | 1/15 (6.7) | 6/46 (13.0) | 1/1 (100) | 1/2 (50.0) | 2/10 (20.0) | 0/5 |
| 70–79 y | 239/322 (74.2) | 231/265 (87.2) | 0/5 | 2/31 (6.5) | 2/4 (50.0) | 1/1 (100) | 3/14 (21.4) | 0/2 |
| ≥80 y | 70/94 (74.5) | 70/86 (81.4) | 0 | 0/7 | 0 | 0 | 0/1 | 0 |
| Sex | ||||||||
| Men | 454/661 (68.7) | 441/525 (84.0) | 0/15 | 8/91 (8.8) | 2/3 (66.7) | 1/2 (50.0) | 2/15 (13.3) | 0/10 |
| Women | 406/532 (76.3) | 392/435 (90.1) | 2/21 (9.5) | 6/53 (11.3) | 1/2 (50.0) | 1/2 (50.0) | 4/14 (28.6) | 0/5 |
UN-D = unclassifiable dementia.
Data are n followed by percentage in parentheses.