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Table 3 Baseline characteristics in the propensity-matched cohort
| 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 |
