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Vitamin D level in rheumatoid arthritis and its correlation with the disease activity: a meta-analysis

1, 2


  1. Division of Rheumatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
  2. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.

2016 Vol.34, N°5
PI 0827, PF 0833
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PMID: 27049238 [PubMed]

Received: 02/11/2015
Accepted : 14/01/2016
In Press: 06/04/2016
Published: 16/09/2016


This study aimed to evaluate the relationship between the 25-hydroxyvitamin D [25(OH)D] level and rheumatoid arthritis (RA) and the correlation between serum vitamin D level and RA activity.
We searched the PUBMED, EMBASE, and Cochrane databases and performed a meta-analysis examining the vitamin D level and prevalence of vitamin D deficiency in patients with RA compared to healthy controls and the correlation coefficients between the vitamin D level and disease activity score 28 (DAS28) in RA patients.
Fifteen studies that included a total of 1,143 RA patients and 963 controls were available for this meta-analysis. The meta-analysis showed that the serum vitamin D level in the RA group was significantly lower than that in the control group (SMD=−0.608, 95% CI=−1.105–[−0.017], p=0.017). In addition, the prevalence of vitamin D deficiency was significantly higher in the RA group than in the control group (55.2% vs. 33.2%; OR = 2.460, 95% CI = 1.135–5.332, p=0.023). Thirteen studies evaluated the correlation between the vitamin D level and its activity in 924 RA patients. Meta-analysis showed a significant inverse correlation between the vitamin D level and DAS28 (Correlation coefficient =−0.278, 95% CI =−0.393–[−0.153], p=1.8 x 10−5).
Our meta-analysis demonstrates that serum vitamin D level is significantly low in patients with RA, vitamin D deficiency is prevalent in RA patients compared to controls, and the vitamin D level correlates inversely with RA activity. Our meta-analysis suggests that the vitamin D level is associated with susceptibility to RA and RA activity.

Rheumatology Article