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