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. Author manuscript; available in PMC: 2011 Dec 1.
Published in final edited form as: J Clin Periodontol. 2010 Sep 28;37(12):1068–1074. doi: 10.1111/j.1600-051X.2010.01625.x

Table 1.

Comparison of demographics and clinical characteristics between study groups.

RA (n=35) Healthy (n=35) Periodontitis (n=35) P Value
Age (years; mean +/− SD) 46.8 +/− 10.5 43.0 +/− 10.6 44.2 +/− 8.2
Female (%) 77.2 74.3 71.4
White (%) 94.3 85.7 54.3 <0.006*
Hispanic (%) 2.9 5.7 17.1
African American 0 0 11.4
Asian (%) 2.9 8.6 14.3
Current tobacco use (%) 11.4 0 17.1 0.065*
Current alcohol use (%) 25.7 37.1 11.4 <0.001*
# Teeth 26.4 +/− 3.0 27.0 +/− 2.5 26.3 +/− 1.9
Periodontal indices (% sites; mean +/− SD)
Plaque sites 48.4 +/− 31.5 41.7 +/− 41.8 136.8 +/− 21.3 <0.0001**
BOP Sites 13.0 +/− 10.4 4.6 +/− 5.5 0.012***
55.0 +/− 23.5 <0.0001**
PD Sites ≥4 mm 4.9 +/− 8.6 1.8 +/− 2.3 27.0 +/− 15.0 <0.0001**
PD Sites ≥5 mm 1.7 +/− 3.4 0.2+/− 0.5 16.4 +/− 11.4 <0.0001**
CAL ≥2 mm 3.4 +/− 6.7 2.7 +/− 5.9 17.6 +/−11.8 <0.0001**
*

determined by Fisher’s exact test.

**

determined by ANOVA and applies to comparisons of Periodontitis vs. RA or Healthy.

***

determined by ANCOVA and applies to comparisons of RA vs. Healthy.

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