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Table 4 Mean 25(OH)D levels and proportion of patients with 25(OH)D levels <20 ng/ml according to categorical variables in non vitamin D supplemented patients

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

Categorial variable   Mean Standard deviation P % with 25(OH)D <20 ng/ml P
Disease Remission No 21.7 11.3 0.008 51.6% <0.001
  Yes 24.2 12.1   35.4%  
DAS28 <3.1 23.1 9.9 0.008 34.1% <0.001
  3.1 to 5.1 20.2 11.8   59.3%  
  >5.1 19.4 9.2   62.0%  
Steinbrocker Functional state 1 24.3 13.0 <0.001 40.7% 0.001
  >1 21.1 10.4   52.0%  
Treatment Response Good 23.6 13.1   41.4% <0.001
  Fair 21.5 10.0 0.010 51.2%  
  No 20.4 10.4   58.8%  
Sun exposure time <10 minutes 20.7 10.3 0.008 50.5% 0.049
  10 to 20 minutes 21.1 9.1   52.3%  
  20 to 30 minutes 22.3 12.1   51.4%  
  >30 minutes 23.9 13.0   42.5%  
  1. Abbreviations: 25(OH)D, 25-hydroxyvitamin D; ANOVA, analysis of variance); DAS 28, Disease Activity Score 28. P-values were obtained by ANOVA and Chi square test.