Figs 4

A-C Cumulative overall survival (OS) estimates by A) hospital volume, B) hospital level, C) metastatic surgery. Kaplan–Meier estimates of OS including 9,968 patients followed from diagnosis of synchronous metastatic colorectal cancer. The stratification by metastatic surgery was based on a delayed entry of patients in model to 270 days post diagnosis (n = 5,993). P-value from log-rank test was p = 0.001 for A and p < 0.001 for B and C.