Table 2.
Severity of ARDS defined by minimal PaO2/FIO2 ratio and outcome.
| mild ARDS (n = 33) |
moderate ARDS (n = 83) |
severe ARDS (n = 79) |
||
|---|---|---|---|---|
| Ventilator-free days within 28 days |
18 (1-22) | 9 (0-19) | 0 (0-18)* | |
| 28-day mortality | Unadjusted odds ratio |
95% confidence interval | P value | |
| mild ARDS (n = 33) |
18.2% (n = 6) |
1 | (reference) | |
| moderate ARDS (n = 83) |
38.6%** (n = 32) |
2.824 | 1.050-7.590 | 0.048 |
| severe ARDS (n = 79) |
48.1%** (n = 38) |
4.167 | 1.553-11.236 | 0.003 |
*P <0.01 vs. mild ARDS; **P <0.05 vs. mild ARDS. ARDS, acute respiratory distress syndrome.