Fig. 3

Overall survival (OS) and disease-free survival (DFS) after weighting by the Kaplan–Meier method when pre- and post-operative anemia were both considered. A When preoperative and postoperative anemia were both considered, the 5-year OS rates were 71.5%, 70.0%, 73.9%, and 79.6% in the combined preoperative and postoperative anemia, preoperative but not postoperative anemia, postoperative but not preoperative anemia and non-anemia groups, respectively (p < 0.001). B When preoperative and postoperative anemia were both considered, the 5-year DFS rates were 64.1%, 62.6%, 64.6%, and 72.3%, respectively, in these four groups (p < 0.001)