|  | Non-HFOV (n = 118) | HFOV (n = 118) | p value |  |
|---|
|  |  |  | McNemar’s test | OR (95%CI) |
28-day mortality [n (%)] | 20 (16.9) | 38 (32.2) | 0.01 | 2.3 (1.3, 4.4) |
| Â | Â | Â | Kruskal-Wallis test | MD (95% CI)* |
VFD (median [IQR]) | 4.0 [0.0, 17.8] | 4.0 [0.0, 16.0] | 0.29 | −1.3 (−3.4, 0.9) |
IFD (median [IQR]) | 4.0 [0.0, 15.8] | 0.0 [0.0, 11.0] | 0.03 | −2.5 (−4.9, −0.5) |
- Categorical variables are presented as counts (percentages), continuous variables are presented as median [IQR]
- HFOV high-frequency oscillatory ventilation, VFD 28-day ventilator-free days, IFD 28-day intensive care unit-free days, MD mean difference, OR odds ratio, 95% CI 95% confidence interval
- *VFD and IFD did not follow normal distribution; therefore, we performed non-parametric Kruskal-Wallis test to determine the group differences and calculated the p values. Note that we still provide calculations for MD and corresponding 95% CI for VFD and IFD (assuming normal distribution), but the value of MD and 95% CI are only rough references. They should NOT be taken as true estimates and these need to be interpreted with caution
