Table 1. Demographic and clinical characteristics on admission and the outcome of the studied subjects.
| Variable | Measure | Range |
|---|---|---|
| Gender (male/female) | 283/168 (1.7: 1) | Not available |
| Age(year) | 56.7±18.7 | 11‑97 |
| APACHE II | 19.0±7.9 | 2‑45 |
| Heart rate(beats per minute) | 96.6±22.4 | 38‑178 |
| Systolic blood pressure(mmHg) | 121.5±20.4 | 53‑228 |
| Diastolic blood pressure(mmHg) | 67.7±13.2 | 23‑113 |
| Mean blood pressure(mmHg) | 85.5±13.4 | 35.7‑140 |
| Urine output per hour(ml) | 60(30, 100) | 0‑500 |
| Respiratory rate(times per minute) | 18.4±5.0 | 9‑46 |
| PaO2/ FiO2 | 204(142,286) | 41.5‑901 |
| Ventilation/Non-ventilation | 388/63 (6.2: 1) | Not available |
| PEEP(cmH2O) | 6.8±2.8 | 3‑28 |
| Length of mechanical ventilation(hours) | 117(28,299) | 0‑2293 |
| ICU length of stay(day) | 11(5,20) | 1‑89 |
| Hospital length of stay(day) | 20(11,34) | 1‑402 |
| ICU mortality | 30.6%(138/451) | Not available |
| Hospital mortality | 31.5%(142/451) | Not available |
Values were expressed as mean ± standard deviation or median (interquartile range) and %(n/N), according to type of data and data distribution; abbreviations: APACHE II, Acute Physiology, Age, Chronic Health Evaluation II; PaO2, partial pressure of oxygen in arterial blood; FiO2, fraction of inspired oxygen; PEEP, positive end expiratory pressure.