Table 2.

Comparison of alpha diversity indices of gut microbiota between the healthy volunteers (H) and CRC patients before and after surgery (A0 and A1).

Group	Richness	Phylogenetic diversity	Shannon diversity	Simpson diversity
A0	(199 ± 56)a	(15.10 ± 4.00)a	(4.63 ± 0.91)a	(0.90 ± 0.08)a
A1	(166 ± 77)a	(14.14 ± 5.25)a	(3.40 ± 1.27)b	(0.76 ± 0.23)b
H	(187 ± 41)a	(14.31 ± 2.44)a	(4.34 ± 0.91)a	(0.88 ± 0.08)a

Values are shown as mean ± standard deviation. Richness means the detected gene/sequence numbers. Significant differences among different groups are indicated by alphabetic letters, P < 0.05. The ‘a’ means there are no significance differences among groups. The ‘b’ means the group is significantly different from other two groups.