Prevalence of Amyloid Positivity on PET Scans Across Diagnostic, Sex, and Age Groups
| Parameter | Amyloid-positive | P |
| Diagnosis | <0.001 | |
| AD | 833 (86.7) | |
| FTD | 2 (5.6) | |
| MCI | 14 (9.7) | |
| DLB + CBS | 5 (55.6) | |
| VaD | 6 (20.7) | |
| Total group | ||
| Age group | 0.004 | |
| <40 y | 12 (66.7) | |
| 40–49 y | 32 (50.0) | |
| 50–59 y | 221 (73.7) | |
| 60–69 y | 286 (72.4) | |
| 70–79 y | 239 (74.2) | |
| ≥80 y | 70 (74.5) | |
| Sex | 0.002 | |
| Men | 454 (68.7) | |
| Women | 406 (76.3) | |
| AD group | ||
| Age group | 0.569 | |
| <40 y | 12 (92.3) | |
| 40–49 y | 32 (82.1) | |
| 50–59 y | 213 (88.4) | |
| 60–69 y | 275 (87.0) | |
| 70–79 y | 231 (87.2) | |
| ≥80 y | 70 (81.4) | |
| Sex | 0.004 | |
| Men | 441 (83.4) | |
| Women | 392 (90.1) |
Data are n followed by percentage in parentheses.