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. Author manuscript; available in PMC: 2014 Oct 26.
Published in final edited form as: Stat Med. 2014 Jan 29;33(15):2554–2566. doi: 10.1002/sim.6101

Figure 1.

Figure 1

Data structures of patients with or without IBTR. R is an indicator of IBTR occurrence (1 if IBTR occurs, 0 otherwise), tR is time from BCT to IBTR, and tD is time from BCT to death or censoring. BCT, breast conservation therapy; IBTR, ipsilateral breast tumor relapse.