B. Multivariable logistic regression analysis for IFX absence at W54 including ITL at W2 (Model I) and at W6 (Model II) as possible predictors.

Factors OR 95%CI
Model I
Female sex 1.09 0.09-13.18
Age 1.09 1.03-1.17
DAS28 0.64 0.36-1.14
MTX non-use 12.26 1.83-82.22
Levels below cut-off at W2 (21.2 μg/mL) 15.85 2.95-85.03
Model II
Female sex 0.65 0.05-7.97
Age 1.05 0.98-1.12
DAS28 0.64 0.31-1.30
MTX non-use 6.91 1.04-45.84
Levels below cut-off at W6 (4.4 μg/mL) 86.64 6.58-1139.99

ACPA, anti-cyclic citrullinated peptide antibodies; CRP, C-reactive protein; CI, confidence interval; DAS28, Disease Activity Score in 28 joints; MTX, methotrexate; OR, odds ratio; TNF-α, tumour necrosis factor α; ITL, Infliximab trough levels.