Table 3.
Hyperoxemia and ICU-free days
| Hyperoxemia | Non-hyperoxemia | Difference | 95% CI | P value | |
|---|---|---|---|---|---|
| Unadjusted analyses | |||||
| ICU-free days until day 28, median (IQR) | 17 (10–21) | 23 (16–26) | − 4 | − 2 to − 7 | < 0.001 |
| - Intubated at ED | 17 (11–20) | 15 (8–23) | 0 | − 3 to 4 | 0.832 |
| - Not intubated at ED | 22 (10–28) | 24 (21–27) | − 2 | − 9 to 2 | 0.356 |
| IPWa | |||||
| ICU-free days until day 28, median (IQR) | 16 (10–22) | 19 (12–24) | − 2 | − 4 to 0 | 0.123 |
| - Intubated at ED | 18 (9–20) | 15 (8–23) | 0 | − 3 to 3 | 0.777 |
| - Not intubated at ED | 16 (12–22) | 23 (19–26) | − 5 | −3 to − 10 | 0.004 |
| Ventilator-free days until day 28, median (IQR) | 19 (10–26) | 22 (7–27) | − 1 | − 3 to 0 | 0.123 |
| - Intubated at ED | 18 (0–20) | 18 (4–25) | 0 | − 4 to 0 | 0.265 |
| - Not intubated at ED | 25 (15–26) | 28 (23–28) | − 2 | − 3 to 0 | 0.014 |
| Survival rate | 85.2% | 82.7% | OR = 1.21 | 0.62 to 2.35 | 0.590 |
CI confidence interval, IQR interquartile range, ED emergency department, IPW inverse probability weighting
aIPW was performed using propensity scores, and data were presented after excluding patients with propensity score of < 0.1 or > 0.9