Figure 1.

Probability of relapse in the next 60 days versus time after study entry.

The line in grey is the step function showing the nonparametric Kaplan Meier estimator. The fitted gamma function is shown by the black line; the dashed lines show the 95% confidence intervals. The fitted parameters are $\widehat{\alpha }=-0.0131$ (95% CI: −0.0134, −0.0128), $\widehat{\gamma }=0.0069$ (95% CI: 0.0066, 0.0071), and $\widehat{\text{c}}=-10.19$ (95% CI: −11.98, −8.41). At day 0, the probability of relapse within next 60 days was 6.6% ± 1.5%. The maximum risk of relapse was on day 66 when the probability was 19.3% ± 1.4%. After day 268, the relapse risk declined to below 5%.