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Table 3 Rigidity index and hyaluronic acid concentration in patients with active Rheumatoid Arthritis and their controls

From: In vitro and ex vivo effect of hyaluronic acid on erythrocyte flow properties

  [HA]s (μg/ml) RI
Controls (n = 40) 20.0 ± 9.0 7.0 ± 0.8
RA Patients (n = 100) 155.80 ± 44.0 11.0 ± 1.3
P < 0.00001 < 0.001
  1. [HA]s: serum concentration of hyaluronic acid; RI: rigidity index; RA: rheumatoid arthritis.