Table 3.

Multiple linear regression analysis of clinical characteristics in relation to Collinsella aerofaciens OTUs (dependent variable) in RA patients.

Independent Variables	B	p	95% Confidence Intervals for B
			Lower Boundary	Upper Boundary
Age	−0.347	0.018	−21.6	−2.1
Smoking	0.300	0.036	8.8	256.4
High ACPA	0.323	0.025	27.4	390.0

R² Nagelkerke = 0.32, Predictor variables: gender, age, smoking, high ACPA, HAQ, bDMARDs. ACPA Anti-cyclic citrullinated peptide antibody; DAS28 Disease activity score 28; bDMARDs Biologic disease-modifying anti-rheumatic drugs; HAQ Health Assessment Questionnaire; OTUs Operational taxonomic units. Significant differences p < 0.005.