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Table 1 The clinicopathological characteristics of the patients

From: Chronic respiratory disease and survival outcomes after extracorporeal membrane oxygenation

Variable Number (%) Mean (SD)
Age, year   53.4 (15.2)
Sex, male 2032 (66.5)  
Residence at ECMO treatment   
 Capital city (Seoul) 770 (25.2)  
 Other metropolitan city 631 (20.7)  
 Other area 1654 (54.1)  
Year of ECMO treatment   
 2006 114 (3.7)  
 2007 144 (4.7)  
 2008 186 (6.1)  
 2009 223 (7.3)  
 2010 271 (8.9)  
 2011 342 (11.2)  
 2012 439 (14.4)  
 2013 580 (19.0)  
 2014 756 (24.7)  
Annual income level at ECMO treatment   
 Q1 (Lowest) or unknown 748 (24.5)  
 Q2 535 (17.5)  
 Q3 763 (25.0)  
 Q4 (Highest) 1009 (33.0)  
Annual case volume of ECMO therapy   
 Q1 < 19 508 (16.6)  
 Q2: 19–43 735 (24.1)  
 Q3: 44–102 100 (34.4)  
 Q4 > 102 762 (24.9)  
Charlson comorbidity index   2.8 (2.2)
Underlying disability   
 Mild to moderate 464 (15.2)  
 Severe 340 (11.1)  
Length of hospital stay, day   24.6 (15.2)
Duration of ECMO therapy, day   6.2 (10.3)
5-year all-cause mortality 556 (18.2)  
Main diagnosis at ECMO treatment   
 Cardiovascular group 1930 (63.2)  
 Respiratory group 281 (9.2)  
 Others 844 (27.6)  
  1. SD standard deviation, ECMO extracorporeal membrane oxygenation