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Serum Vitamin D Level and Rheumatoid Arthritis Disease Activity: Review and Meta-Analysis

Table 1

Characteristics of the included studies.

rD: correlation between Vitamin D and DAS28; rE: correlation between Vitamin D and ESR; rC: correlation between Vitamin D and CRP; A: DAS28≥2.6; B: DAS28<2.6; NG: not given; RIA: radio-immunoassay; CLIA: chemiluminescent immunoassay; HPLC: high-performance liquid chromatography; ELISA: enzyme-linked immunosorbent assay; LCMS/MS: liquid chromatography tandem mass spectrometry; US: United States; ACR: American College of Rheumatology; EULAR: European League Against Rheumatism.

Table 1

doi: https://doi.org/10.1371/journal.pone.0146351.t001