Table 2.

Alpha diversity analysis on OTU level between HC and AN groups.

Item	Sobs index	Chao index	Ace index	Shannon index	Simpson index
HC	145.60 ± 37.93	198.57 ± 52.69	210.27 ± 57.73	3.37 ± 0.48	0.09 ± 0.07
AN	138.80 ± 36.85	177.64 ± 50.72	183.07 ± 53.10	3.33 ± 0.55	0.09 ± 0.10
Z	−0.495	−1.331	−1.789	−0.251	−0.163
P-value	0.626	0.186	0.075	0.807	0.877

Data are expressed as mean ± standard deviation. AN: Anorexia nervosa; HC: Healthy controls; OTU: Operational taxonomic unit.