Figure 4. Baseline Variables That Increase the Risk of Conversion to β-Amyloid (Aβ)+.

Survival functions show (A) elevated risk of conversion with elevated [¹⁸F]florbetapir (FBP) shown as 5-Centiloid intervals (>0) relative to the reference group (Centiloids < 0). (B) Older age (note that age was a continuous variable in the proportional hazards model but is shown as categorical for illustration purposes) and (C) increased risk of conversion among female versus male APOE ε4 carriers. HR = hazard ratio.