The 95% confidence intervals in a survival curve become wider for later time periods because there are fewer individual remaining and the estimate is therefore less precise.

Question

Quizplus · Accepted Answer

As time progresses in a survival analysis, the number of individuals at risk decreases due to events or censoring, leading to wider confidence intervals because the estimate of the survival probability becomes less precise with fewer data points.

The 95% Confidence Intervals in a Survival Curve Become Wider