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

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


aControls were matched for age and gender. MI, myocardial infarction.

Linos et al. Arthritis Research & Therapy 2013 15:R7   doi:10.1186/ar4135

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