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Table 3 Bivariate correlation analyses of serum anti-citrullinated protein antibodies with clinical RA Parameters

From: Antibodies against citrullinated proteins in relation to periodontitis with or without rheumatoid arthritis: a cross-sectional study

RAPd (n = 20)

RA (n = 20)

ACPA

r

p-value

ACPA

r

p-value

ESR

0.242

0.141

ESR

 − 0.133

0.577

Disease duration

0.262

0.264

Disease duration

 − 0.012

0.961

  1. Spearman rho correlation test; r-value: 0.5–1.0 (strong correlation); − 0.3 to 0.5 (moderate correlation); below 0.3 (weak to no correlation)
  2. RA, Rheumatoid arthritis; Pd, Periodontitis; RAPd, Subjects with RA and Pd; RA, Subjects with RA but without Pd; ACPA, anti-citrullinated protein antibodies; ESR, Erythrocyte sedimentation rate
  3. **Significant at p < 0.05