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The Stata command sts graph, by(group) produces the above Kaplan-Meier estimates. (The figure has been edited for appearance.) The Thiotepa group had longer time to recurrence. The median survival time can be read from the figure, where S(t) = 0.5. The medians for the control and thiotepa groups are 16 and 26 months, respectively. The survival curves are roughly parallel, suggesting that an assumption of proportional hazard is acceptable. |