Table 1 Comparison of demographic data and laboratory findings in rheumatoid arthritis patients and controls

Age, years, median (min–max)

45.00 (26–73)

45.00 (29–68)

0.897

Female, n (%)

38 (71.7)

40 (75.50)

0.659

 Postmenaposal, n (%)

16 (42.1)

16 (40.0)

0.850

Laboratory

 Biochemical, mean ± SD

  Corrected calcium, mg/dl

9.2 ± 0.4

8.8 ± 0.4

 < 0.001^*

  Phosphorus, mg/dl

3.0 ± 0.6

3.5 ± 0.6

 < 0.001^*

  GFR, ml/minute

101.8 ± 21.2

104.2 ± 23.0

0.576

 Hormonal, median (min–max)

  25-hydroxyvitamin D, ng/ml

10.0 (3.0–40.0)

16.0 (5.0–29.7)

0.002^*

  PTH, pg/ml

67.0 (16–474)

34.4 (16–89)

 < 0.001^*

  FGF23, pg/ml

20.6 (11.2–51.0)

26.4 (12.6–49.5)

 < 0.001^*