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Table 1 Baseline characteristics of the ETCO2 group and the untreated group

From: End-tidal carbon dioxide monitoring may be associated with a higher possibility of return of spontaneous circulation during out-of-hospital cardiac arrest: a population-based study

Variables ETCO2 group Untreated group P value
(n = 83) (n = 4958)
Male, no. (%) 44 53.0 3138 63.3 0.054
Mean age in years (SD) 71.3 15.2 67.9 17.6 0.088
Attempted defibrillation, no. (%) 14 16.9 878 17.7 0.842
Mean CPR time (10 min) (SD) 2.4 1.4 2.4 1.6 0.927
Socioeconomic status, no. (%)      0.236
 Low 56 67.5 3586 72.3  
 Moderate 26 31.3 1212 24.5  
 High 1 1.2 160 3.2  
Urbanization level, no. (%)      0.118
 Urban 26 31.3 1174 23.7  
 Suburban 29 35.0 2259 45.6  
 Rural 28 33.7 1525 30.7  
Diabetes, no. (%) 25 30.1 1255 25.3 0.318
Hypertension, no. (%) 43 51.8 2434 49.1 0.624
Coronary artery disease, no. (%) 16 19.3 1075 21.7 0.598
Hyperlipidemia, no. (%) 21 25.3 893 18.0 0.087
Malignancies, no. (%) 6 7.2 231 4.7 0.273
Heart failure, no. (%) 1 1.2 255 5.1 0.105
Atrial fibrillation, no. (%) 3 3.6 107 2.2 0.368
Charlson comorbidity index score, no. (%)      0.821
 0 25 30.1 1631 32.9  
 1 24 28.9 1307 26.4  
 ≥ 2 34 41.0 2020 40.7  
Intracerebral hemorrhage, no. (%) 1 1.2 108 2.2 0.545
Ischemic stoke, no. (%) 16 19.3 887 17.9 0.744
Chronic renal insufficiency, no. (%) 2 2.4 233 4.7 0.326
Liver cirrhosis, no. (%) 16 19.3 550 11.1 0.019
Health care institutes, no. (%)      <0.001
 Medical centers 36 43.4 1108 22.3  
 Regional hospitals 41 49.4 2497 50.4  
 Local hospitals 6 7.2 1333 26.9  
 Clinics 0 0 20 0.4  
Mean propensity score (SD) 0.046 0.041 0.016 0.021 <0.001