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Table 1 Patient characteristics from a cardiac surgery registry 2001-2009

From: Hospital-level associations with 30-day patient mortality after cardiac surgery: a tutorial on the application and interpretation of marginal and multilevel logistic regression

Patient characteristics

Frequency

Percent

Age (years)

  

< 60

8954

27.6

60 to 70

9434

29.2

70 to 80

10695

33.1

80+

3271

10.1

Gender

  

Male

23385

72.3

Female

8969

27.7

The New York heart association class

  

I&II

22470

69.4

III

7245

22.4

IV

2639

8.2

Urgency of procedure

  

Elective

19869

61.4

Urgent

10665

33.0

Emergency/salvage

1807

5.6

Ejection fraction estimate (%)

  

Mild (> 45)

21919

80.0

Moderate (30-45)

3828

14.0

Severe (< 30)

1656

6.0

Hypercholesterolaemia

22072

68.6

Preoperative dialysis

523

1.6

Previous cardiac surgery

2776

8.6

Procedure type

  

CABG

19907

61.6

Valve(s)

4571

14.1

Valve(s)+CABG

3367

10.4

Other

4472

13.8

Inotropic medication

888

2.8

Peripheral vascular disease

3583

11.1

Body mass index (kg/m 2 )

  

< 25

9077

28.1

25+

23277

71.9