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Table 1 Baseline clinical characteristics of the study patients

From: Who benefits most from mild therapeutic hypothermia in coronary intervention era? A retrospective and propensity-matched study

  Hypothermia group (n= 110) Normothermia group (n= 290) P value
Age (years) 55 (46 to 68) 74 (62 to 83) <0.001
Male gender 90 (82) 177 (61) <0.001
Pittsburgh overall performance category scale before index cardiac arrest    <0.001
   Category 1 109 (99) 216 (74)  
   Category 2 1 (1) 62 (21)  
   Category 3 0 (0) 12 (4)  
   Category 4 0 (0) 0 (0)  
Initial rhythm    <0.001
   Ventricular fibrillation 64 (58) 41 (14)  
   Pulseless electrical activity 23 (21) 134 (46)  
   Asystole 23 (21) 115 (40)  
Bystander cardiopulmonary resuscitation 61 (55) 137 (47) 0.14
Time interval from collapse to start of cardiopulmonary resuscitation (minutes) 6 (1 to 10) 7 (1 to 14) 0.049
Time interval from collapse to return of spontaneous circulation (minutes) 35 (21 to 48) 43 (23 to 56) <0.01
Admission after 2006 83 (75) 169 (58) <0.01
Hypertension 44 (40) 85 (29) 0.04
Diabetes mellitus 29 (26) 47 (16) 0.02
Previous history of heart disease 42 (38) 63 (22) <0.001
Previous history of myocardial infarction 18 (16) 15 (5) <0.001
Previous history of chronic heart failure 16 (15) 27 (9) 0.13
Cause of cardiac arrest    
   Acute coronary syndrome 46 (41) 56 (19)  
   Old myocardial infarction 12 (11) 4 (1)  
   Cardiomyopathy 13 (12) 8 (3)  
   Spasm of coronary artery 8 (7) 2 (1)  
   Others 27 (25) 72 (25)  
   Unknown 4 (4) 148 (51)  
  1. Data presented as median (interquartile range) or n (%).