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Table 1 Characteristics of patients and controls hospitalized for dermatomyositis (1993 to 2007)

From: Atherosclerotic cardiovascular disease and dermatomyositis: an analysis of the Nationwide Inpatient Sample survey

Characteristics Patients with dermatomyositis Controlsa
Total number in sample 10,156 76,440
Weighted number (to US population) 50,323 376,744
Mean age, years 58.3 58.5
Percentage of females 73.2 73.4
Race, percentage   
   White 53.2 71.4
   Black 11.8 15.5
   Hispanic 7.6 10.1
   Other 3.7 3.0
   Missing 23.6 0
Income, percentage   
   1 (lowest category) 19.7 28.2
   2 22.4 23.8
   3 23.7 22.3
   4 (highest category) 31.3 22.8
   Missing 2.9 2.9
Hospital type   
   Rural 11.6 11.5
   Urban, non-teaching 39.3 43.5
   Urban, teaching 49.1 45.0
Mean length of hospitalization, days 8.0 5.1
Mean total charges, US dollars 28,545 33,853
Any cardiovascular diagnosis, percentage 20.4 21.1
   MI or acute coronary artery disease 4.4 5.7
   Angina 1.2 1.7
   Angina pectoris 1.2 1.3
   Angina (either) 2.5 2.8
   Congestive heart failure 11.8 9.9
   Coronary artery bypass graft 0.4 0.01
   Coronary catheterization 2.9 0
   Percutaneous transluminal coronary angioplasty 0.8 0
Charlson comorbidity index 1.4 1.2
Overall in-hospital death rate per 1,000 56.5 24.0
  1. aControls were matched for age and gender. MI, myocardial infarction.