Table 4 The result of two-piecewise linear regression model of SII with DAS28-ESR and DAS28-CRP.

From: Association between systemic immune-inflammation index and disease activity score 28 in patients with rheumatoid arthritis: a cross-sectional study

 

DAS28-ESR

β (95% CI)

DAS28-CRP

β (95% CI)

Fitting model by standard linear regression

0.46 (0.38, 0.55)

0.55 (0.47, 0.63)

Fitting model by two-piecewise linear regression

Inflection point of Ln SII

5.56

5.56

< 5.56

−0.56 (−1.13, 0.02)

−0.35 (−0.91, 0.20)

> 5.56

0.53 (0.44, 0.63)

0.63 (0.53, 0.72)

P for log likelihood ratio test

< 0.001

0.001

  1. The models were adjusted for sex, age, smoking, hypertension, hemoglobin, monocyte count, rheumatoid factor, glucocorticoids, conventional disease-modifying antirheumatic drugs, biological disease-modifying antirheumatic drugs, and targeted synthetic disease-modifying antirheumatic drugs.
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