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Table 2 Incidence rate of CAC (among participants with no CAC at baseline)

From: Progression of coronary artery atherosclerosis in rheumatoid arthritis: comparison with participants from the Multi-Ethnic Study of Atherosclerosis

  RA Controls
(Number = 73) (Number = 381)
Incident CAC, number 20 65
Person-year 243 895
Incidence rate (100 person/year) 8.2 7.3
Unadjusted IRR 1.14 (0.73, 1.75)
  IRR - Model 1a 1.28 (0.83–1.98)
  IRR - Model 2b 1.02 (0.63, 1.65)
  IRR - Model 3c 1.11 (0.66, 1.88)
  1. aAdjusted for age; badjusted for age, gender, ethnicity, smoking, dyslipidemia, diabetes, and hypertension; cinteraction with gender (P for interaction = 0.56). CAC, coronary artery calcium; IRR, incidence rate ratio; RA, rheumatoid arthritis.