Mean Difference and Percentage Change Between Consecutive Scans Across All Participants
| PiB1 vs. PiB2 | PiB2 vs. florbetapir | |||||
| Parameter | Pons | Whole cerebellum | Cerebellar gray | Pons | Whole cerebellum | Cerebellar gray |
| Difference | 0.05 (0.20) | 0.10 (0.33) | 0.13 (0.40) | −0.12 (0.16) | −0.28 (0.24) | −0.37 (0.32) |
| Percentage change | 1 (6) | 3 (6) | 4 (7) | −8 (15) | −15 (11) | −17 (13) |
Data in parentheses are SDs, reflecting increases in tracer retention between first and second PiB scans and between second PiB and florbetapir scans, separately for each reference region. Positive value represents mean increase from PiB1 to PiB2 or from PiB2 to florbetapir, whereas negative value represents decrease.