Risk of Serious Infection in Patients With Rheumatoid Arthritis Treated With Biologic Versus Nonbiologic Disease-Modifying Antirheumatic Drugs.

In the sensitivity analyses using PS in quintiles and PS calculated without the number of prior bDMARDs, the risk of SIs associated with bDMARDs compared with csDMARDs was similar to that in primary analyses, although SI risk with TNFis did not reach statistical significance when the PS without the number of prior bDMARDs was used (Table 4 ).

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