Table 2.

The Dysbiosis Index Score (a five‐step semiquantitive measure of intestinal dysbiosis) and P. copri levels in relation to disease activity, disease duration, fecal calprotectin, and serology at baseline^*

	Correlation with Dysbiosis Index Score, rs	Correlation with P. copri, rs
DAS28‐CRP	0.11, P = 0.479	−0.04, P = 0.780
Disease duration	0.22, P = 0.118	0.11, P = 0.445
F‐calprotectin	0.33, P = 0.018	−0.06, P = 0.677
Dysbiosis Index Score	N/A	−0.11, P = 0.430

	Median levels, (yes vs no)
	Dysbiosis Index Score	P. copri, ng per g feces
RF‐positivity	3.0 vs 3.0, P = 0.304	1.2e‐3 vs 0.0, P = 0.034
ACPA‐positivity	3.0 vs 3.0, P = 0.789	9.6e‐5 vs 4.5e‐5, P = 0.340

^*ACPA, anticitrullinated peptide antibodies; DAS28‐CRP, disease activity score based on 28‐joint counts; N/A, not applicable; P. copri, Prevotella copri; RF, rheumatoid factor.