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Table 3 Baseline characteristics in the propensity-matched cohort

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 = 53) (n = 1060)
Male, no. (%) 27 50.9 644 60.8 0.154
Mean age in years (SD) 68.9 15.9 69.6 16.7 0.776
Attempted defibrillation, no. (%) 11 20.8 183 17.3 0.513
Mean CPR time (10 min) (SD) 2.7 1.4 2.5 1.6 0.394
Socioeconomic status, no. (%)      0.864
 Low 38 71.7 727 68.6  
 Moderate 14 26.4 316 29.8  
 High 1 1.9 17 1.6  
Urbanization level, no. (%)      0.929
 Urban 13 24.5 276 26.0  
 Suburban 23 43.4 469 44.3  
 Rural 17 32.1 315 29.7  
Diabetes, no. (%) 11 20.8 272 25.7 0.424
Hypertension, no. (%) 26 49.1 521 49.2 0.989
Coronary artery disease, no. (%) 10 18.9 200 18.9 1.000
Hyperlipidemia, no. (%) 10 18.9 211 19.9 0.853
Malignancies, no. (%) 3 5.7 44 4.2 0.594
Heart failure, no. (%) 1 1.9 19 1.8 0.959
Atrial fibrillation, no. (%) 1 1.9 16 1.5 0.827
Charlson Comorbidity Index score, no. (%)      0.935
 0 19 35.9 355 33.5  
 1 15 28.3 305 28.8  
 ≥ 2 19 35.9 400 37.7  
Intracerebral hemorrhage, no. (%) 1 1.9 26 2.5 0.794
Ischemic stoke, no. (%) 8 15.1 198 18.7 0.512
Chronic renal insufficiency, no. (%) 2 3.8 36 3.4 0.883
Liver cirrhosis, no. (%) 4 7.6 128 12.1 0.320
Health care institutes, no. (%)      0.959
 Medical centers 15 28.3 288 27.2  
 Regional hospitals 32 60.4 639 60.3  
 Local hospitals 6 11.3 133 12.6  
 Clinics 0.0209 0.0125 0.0207 0.0125 0.917