Figure 3. Survival curve showing outcomes for 2 treatments groups with number at risk at each time point. While numbers at risk are not essential to include in a survival analysis figure, this presentation conveys more information than the curve alone would. Adapted from Rotman M, Pajak TF, Choi K, et al. Prophylactic extended-field irradiation of para-aortic lymph nodes in stages IIB and bulky IB and IIA cervical carcinomas: ten-year treatment results of RTOG 79–20. JAMA. 1995;274(5):387–393.