Hazard for death associated with prednisone monotherapy and in combination with methotrexate and sulfasalazine. Cox time-varying multivariable regression model, adjusted for age, sex, ethnicity, education level, duration of RA at study entry, BMI, HAQ Disability Index, pain, rheumatology visit (y/n), NSAIDs, DMARDs (excluding the one under study), TNF inhibitors, COX-2 inhibitors, comorbidities and both prednisone and DMARD baseline and time-dependent propensities, stratified by time of study entry and location.