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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