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Table 1 Demographics and health characteristics of the study population. * data missing in some cases

From: The association between rheumatoid arthritis and periodontal disease in a population-based cross-sectional case-control study

VariableRA Group
N = 126
Control group
N = 249
P value
Female %70%56%0.009
Age, mean (SD)70 (6.6)70 (7.1)0.39
Smoking habit % N = 234*0.58
Current/past smokers N (%)78 (61.9%)140 (59.8%)
Socio-economic status (SES)
 White collar47.6%54.2%0.75
 Blue collar52.4%45.8%
BMI, mean (SD)27 (5.1)23 (3.7)0.000
Diabetes (including both type I and II) N (%)17 (13.5%)20 (8.1%)0.10
Interstitial lung disease N(%)5 (4.0%)0 (N = 240*)0.002
Angina pectoris N (%)15 (11.9%)26 (10.5%) N = 247*0.69
Myocardial infarct N (%)10 (7.9%)15 (6.0%) N = 248*0.49
Stroke N (%)11 (8.7) %10 (4.0%) N = 248*0.06
  1. BMI body mass index