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Table 3 Parameters of fluorescent product generation in the real-time coumarin boronic acid assay in idiopathic inflammatory myopathies patients

From: Enhanced systemic oxidative stress response in patients with idiopathic inflammatory myopathies

Parameter

All IIM patients

n = 56

DM

n = 18

Myositis

n = 38

Control

n = 50

p-value

all IIM vs. control

p-value

DM vs. control

p-value

myositis vs. control

p-value DM vs. myositis

Saturating concentration (K), FLU/ml

408.7

(337.3–636.2)

359.8

(298.7–528.1)

425.1

(357–766.2)

295.3

(254.5–361.1)

< 0.001

0.005

< 0.001

0.21

Velocity of fluorescent product growth (R factor), FLU/ml/min

52.2

(42.4–80.4)

47.2

(39.5–67.4)

55.0

(44.5–101)

38.5

(34.3–47.5)

< 0.001

0.01

< 0.001

0.32

Cumulative in-time fluorescent product generation, FLU/ml x min

18 703

(11 396–36 980)

14,362

(9854–23,928)

20,766

(11,860–42928)

11,123

(8235–19,651)

< 0.001

0.27

< 0.001

0.16

  1. Continuous variables are shown as median and 0.25–0.75 quartiles; statistically significant differences are marked in bold (Mann–Whitney test)
  2. Abbreviations: DM dermatomyositis, IIM idiopathic inflammatory myopathies, FLU fluorescence units