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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptHHS Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
 
From:
J Autoimmun. Author manuscript; available in PMC 2013 May 1.
Published in final edited form as:
J Autoimmun. 2012 May; 38(2-3): J97–J102.
Published online 2011 August 30. doi: 10.1016/j.jaut.2011.08.001

TABLE 4

Adjusted Incidence Rate Ratios of Rheumatoid Arthritis and Autoimmune Disease in Female Medicare Beneficiaries, Health and Retirement Study, 1991–2007

Rheumatoid arthritis
Autoimmune diseasea
IRRb95% CIP
value
IRRb95% CIP
value
Number of infection-related visits1.031.02, 1.04<0.0011.031.02, 1.04<0.001
Number of transfusion-related visitsc1.441.15, 1.820.0021.431.18, 1.74<0.001
Number of other hospital staysd1.030.91, 1.150.6631.030.94, 1.130.535
Number of children1.010.96, 1.060.7340.980.93, 1.030.382
Age (years)0.980.96, 1.000.0390.970.95, 0.990.001
Body mass index (kg/m2)1.021.00, 1.050.1011.010.99, 1.030.289
Jewish religion2.001.16, 3.450.0141.851.19, 2.880.007

Abbreviations: IRR, incidence rate ratio; CI, confidence interval.

aIncludes rheumatoid arthritis, Graves' disease, systemic lupus erythematosus, Hashimoto's disease, Sjoren syndrome, celiac disease, systemic sclerosis, multiple sclerosis.
bAdjusted for race, ethnicity, smoking, region of residence, and history of end-stage renal disease, heart disease, stroke, diabetes mellitus and cancer.
cIn persons without an infection-related visit.
dHospital stay without infection or transfusion.