Table 5 Correlations of fgf23 with modified Sharp score, bone mineral density, disease duration, and disease activity in RA patients

Modified Sharp score

 Observer-1

  Total score

0.202

0.159

  Erosion score

0.252

0.077

  Hand

0.266

0.062

  Foot

0.186

0.197

  Joint space narrowing

0.228

0.112

  Hand

0.248

0.082

  Foot

0.150

0.300

 Observer-2

0.210

0.144

  Total score

0.241

0.092

  Erosion score

0.297

0.036

  Hand

0.165

0.254

  Foot

0.232

0.105

  Joint space narrowing

0.260

0.069

  Hand

0.149

0.302

  Foot

0.202

0.159

BMD, gr/cm²

 Femur

 − 0.005

0.972

 Lumbar

 − 0.058

0.681

Disease duration, months

0.094

0.505

Disease activity

 DAS28

0.333

0.015

 ESR, mm/saat

0.316

0.021