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Table 2 Prevalence of periodontitis of rheumatoid arthritis patients compared with the age- and gender-matched control population

From: Periodontitis in established rheumatoid arthritis patients: a cross-sectional clinical, microbiological and serological study

DPSI category Patients with RA
(n= 95)
Control population
(n= 420)
Pvalue Relative risk 95% CI
A: No periodontitis, percentage 30 70 < 0.001   
B: Moderate periodontitis, percentage 43 18 < 0.001 3.6 2.3-5.5
C: Severe periodontitis, percentage 27 12 < 0.001 3.7 2.4-5.9
  1. CI, confidence interval; DPSI, Dutch periodontal screening index; RA, rheumatoid arthritis.