Table 1.

Unadjusted and adjusted odds ratios for recorded diagnoses of venous thromboembolism among adult non-maternal hospitalizations with selected autoimmune diseases, Nationwide Inpatient Sample, 2010

Characteristic	Unweighted sample size	Unadjusted OR (95 % CI) for VTE	Adjusted OR (95 % CI) for VTE
Autoimmune hemolytic anemia	2,866	2.00 (1.68–2.38)	1.25 (1.05–1.49)
Immune thrombocytopenic purpura	9,646	1.49 (1.33–1.66)	1.20 (1.07–1.34)
Rheumatoid arthritis	94,585	1.22 (1.17–1.27)	1.17 (1.13–1.21)
Systemic lupus erythematosus	34,112	1.22 (1.13–1.31)	1.23 (1.15–1.32)
One or more of the above diseases	136,120	1.25 (1.21–1.30)	1.20 (1.16–1.24)

The analysis was weighted to represent all non-maternal hospitalizations among adults ≥19 years age in non-rehabilitation community hospitals

The reference group for the odds ratios is all hospitalizations without the respective autoimmune disease

In adjusted analysis, the factors adjusted for are sex, race/ethnicity, age, selected medical risk factors (cancer, congestive heart failure, stroke, long bone fracture, and infection), venous catheterization, major surgery, and length of hospital stay. Since all four autoimmune diseases were included in a model, the results for each are adjusted with respect to the other three

OR odds ratio, CI confidence interval, VTE venous thromboembolism