Skip to main content

Table 2 Mean and frequency of 25(OH)D values lower than 20 or 30 mg/ml according with ranges of vitamin D supplementations

From: Vitamin D deficiency in rheumatoid arthritis: prevalence, determinants and associations with disease activity and disability

D3 supplementation IU/day N. 25(OH)D ng/ml mean (S.D.) 25(OH)D < 20 ng/ml (%) 25(OH)D < 30 ng/ml (%)
None 654 21.0 (10.2) 51.8% 84.4%
≤ 440 196 26.1 (12.4) 33.2% 74.5%
≥800 318 29.2 (18.5) 31.4% 63.5%
Controls 1,019 19.3 (14.3)a 65.0% a 80.6% b
  1. a = P < 0.01 and b = P < 0.05 versus supplemented RA patients.
  2. Abbreviations: 25(OH)D (25-hydroxyvitamin D).
  3. All differences (both proportions and means) across the three ranges of vitamin D supplementation in RA were statistically significant.