Table 2.

Kruskal–Wallis p values on alpha-diversity metrics at different taxonomic resolution. Covariates are represented as reported in the “Materials and methods” section (“Data retrieval” section, “Patients’ metadata” paragraph): Gender (female F or male M); Outcome (symptomatic S or asymptomatic A); Pneumonia (mild m, moderate M or severe S); Supplemental O₂ and Intubation (yes Y or no N).

	ASV			Species		Genus
	Faith	Pielou	Richness	Pielou	Richness	Pielou	Richness
Gender (F/M)	0.0007	0.030	0.0011	0.0125	0.0007	0.005	0.0005
Outcome (S/A)	0.349	0.450	0.686	0.248	0.471	0.452	0.402
Pneumonia
Mild versus moderate (m/M)	0.583	0.470	0.690	0.449	0.713	0.213	0.708
Mild versus severe (m/S)	0.817	0.741	0.566	0.785	0.612	0.940	0.659
Moderate versus severe (M/S)	0.452	0.966	0.408	0.889	0.323	0.578	0.347
All	0.895	0.445	0.862	0.512	0.854	0.398	0.880
Suppl.O2 (Y/N)	0.914	0.989	0.873	0.890	0.836	0.756	0.876
Intubation (Y/N)	0.647	0.865	0.537	0.414	0.425	0.642	0.427

Statistically significant p values (< 0.05) are highlighted in bold.