Figure 3. Heatmaps of the composition of gut bacterium at phylum, class, order, family, genus, and species levels between the non-POCD and POCD groups. (A) Heatmap (phylum level). (B) Heatmap (class level). (C) Heatmap (order level). (D) Heatmap (family level). (E) Heatmap (genus level). (F) Heatmap (species level).