Fig. 1. Operational taxonomic units (OTUs) and alpha diversity. (A) The number of OTUs in postoperative stool samples was significantly smaller than preoperative stool samples (preoperative vs. postoperative = median 7,920 (3,201–13,025) vs. 2,981 (2,195–10,002), P < 0.001). (B) The alpha diversity (Shannon Index) in postoperative stool samples was also significantly lower than preoperative stool samples (preoperative vs. postoperative = mean 4.16 ± 0.51 vs. 3.68 ± 0.37, P = 0.019).
