A Study of Baricitinib in Participants With Rheumatoid Arthritis

Inclusion Criteria: * Participants must have at least one of the following characteristics: * Documented evidence of a VTE prior to this study * At least 60 years of age * A body mass index (BMI) greater than or equal to 30 kilograms per meter squared (kg/m²), or * Age 50 to less than 60 years and BMI 25 to less than 30 kg/m² * Participants must have an inadequate response or intolerance to at least 1 disease-modifying antirheumatic drugs (DMARD) (synthetic or biologic) Exclusion Criteria: * Participant must not have prior use of a Janus kinase (JAK) inhibitor or have received more than 1 prior TNF inhibitor that was: * discontinued for IR (lack or loss of efficacy) for RA, or * discontinued for intolerance (AE) when used for any indication * Participants must not be pregnant or breastfeeding * Participants must not have had more than one VTE * Participants must not have cancer * Participants must not have active herpes zoster, serious infection, active tuberculosis, or any other serious illness * Participants must not have had a live vaccine within four weeks of study start * Participants must not have participated in any other clinical trial within four weeks of study start * Participants must not have a history of IV drug use, other illicit drug abuse, or chronic alcohol abuse in the past year