Sokka T, Abelson B, Pincus T (2008) Mortality in rheumatoid arthritis: 2008 update. Further research is needed to fully explore the benefits and possible adverse effects of vitamin D supplementation on RA.
Modifying effects between CaD and both solar irradiance and dietary vitamin D intake are suggestive that multiple high vitamin D exposures may increase RA incidence. CaD supplementation did not demonstrate a significant effect on RA incidence in postmenopausal women. Significant effect modifications were seen between CaD and total vitamin D intake and CaD and solar irradiance that suggest increased RA incidence with high vitamin D exposure. No significant modifying effects were seen for stratum of age, solar irradiance, or total vitamin D intake, overall or when adjusted for adherence. In intention-to-treat analyses, no differences were observed in RA incidence. No significant differences in demographics, total personal vitamin D intake, or solar irradiance were seen between the groups. The analysis included 32,435 women without the history of RA, of which 163 incident RA cases were identified over an average of 5.1 years. Cox proportional hazards models were used to compare RA incidence in the treatment versus placebo groups. Incident RA cases were identified via self-report and validated rheumatic medication use. Participants enrolled in the Women’s Health Initiative CaD trial ( n = 36,282) were randomized to 1,000 mg calcium carbonate plus 400 IU of vitamin D 3 daily or to placebo. To determine whether calcium plus vitamin D supplementation (CaD) affects incidence of rheumatoid arthritis (RA).
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