Figure 4

The 95% confidence interval (CI) is within the light blue shaded region. For PGY 4, the ACR score at which point there was a 50% chance of failure was approximately 8 (point e). The upper limit of the 95% CI was 23 (point f). For PGY 5, the ACR score at which point there was a 50% chance of failure was 8 (point g) and the upper limit of the 95% CI was 20 (point h).