Association between testosterone levels and risk of future rheumatoid arthritis in men: a population-based case-control study.
OBJECTIVES: Rheumatoid arthritis (RA) is less common among men than women, and sex hormones have been suggested to play a part in the pathogenesis. Lower levels of testosterone have been demonstrated in men with RA, but it is not known if these changes precede the disease. METHODS: In a nested case-control study, using information and blood samples from a population-based health survey, we identif