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Table 1 Demographic and laboratory data by disease

From: Disease-specific definitions of vitamin D deficiency need to be established in autoimmune and non-autoimmune chronic diseases: a retrospective comparison of three chronic diseases

  SLE RA T2DM P-value
  n = 123 n = 100 n = 3691  
Age, years Median (IQR) 34.5 (26.7, 47.7) 60.5 (52.6, 66.8) 63.3 (53.7, 71.7) <0.001
Gender (% female) 109 (89) 88 (88) 2,686 (73) <0.001
Race/Ethnicity (%)     
   African-American 46 (39) 32 (34) 1,252 (36)  
   Hispanic 39 (33) 42 (45) 1,176 (34) 0.199
   Other 34 (29) 20 (21) 1,046 (30)  
   Unknown 14 (12%) 16 (16%) 217 (6%)  
25OHD, ng/ml     
Median (IQR) 18.0 (11.3, 25.4) 20.9 (16.1, 29.9) 16.8 (11.1, 24.2) 0.0001
Season (%)     
   April-September 61 (50) 50 (50) 1,698 (46) 0.47
Serum creatinine >1.5 mg/dl (%) 16 (13) 2(2) 855 (27) <0.001
Serum calcium, mg/dl     
Median (IQR) 9.2 (8.9, 9.5) 9.5 (9.1, 9.7) 9.6 (9.2, 10) 0.001
Bisphosphonates use (%) 20 (16) 34 (34) 346 (9) <0.001
Calcium supplementation (%) 60 (49) 59 (59) 864 (23) <0.001
Prednisone use (%) 85 (69) 65 (65) 231 (6) <0.001
Vitamin D supplementation (%) 57 (46) 56 (56) 867 (23) <0.0001
  1. SLE, systemic lupus erythematosus; RA, rheumatoid arthritis; T2DM, type 2 diabetes mellitus; 25OHD, 25hydroxyvitamin D; IQR, inter-quartile range.