Table 3.

Differential abundance of members of the phylum Proteobacteria in DA-DTT versus DA-U

	DA-DTT (n = 43) vs. DA-U (n = 112)
Taxonomy	Average relative abundance % DA-DTTa	Average relative abundance % DA-Ua	Fold Change (calculated from the GLM)b	P-value	FDR P-value
p_Proteobacteria, c_Gammaproteobacteria	23.823	10.492	8.44	8.3E-9	4.25E-8
p_Proteobacteria, c_Alphaproteobacteria	1.294	0.145	7.94	4.05E-9	2.60E-8
p_Proteobacteria, c_Deltaproteobacteria	0.008	0.001	6.35	3.08E-5	9.70E-5
p_Proteobacteria, c_Betaproteobacteria	3.569	4.029	−1.26	0.41	0.56
p_Proteobacteria, c_Epsilonproteobacteria	0.281	0.167	1.74	0.14	0.29

P-value< 0.05 and FDR P-value< 0.05 are shown in bold. ^aThe relative abundances were calculated from the original counts (number of sequences in the OTU table). ^bFold changes were calculated from the GLM, which corrects for differences in library size between the samples and the effects of confounding factors. It is therefore not possible to derive these fold changes from the original counts (number of sequences in the OTU table) by simple algebraic calculations