TABLE 5. Multiple regression all patients, duration of intubation (days).
| Estimate | Standard error | t | p | |
|---|---|---|---|---|
| Model 1 (41/573 events) | ||||
| Group (1 vs. 2) | 0.03 | 0.08 | 0.33 | 0.74 |
| Gestational age (1 week) | −0.04 | 0.009 | −4.74 | <0.0001 |
| Sex (male vs. female) | −0.02 | 0.08 | −0.27 | 0.79 |
| FiO2 prior to extubation ×100 (1 unit) | 0.07 | 0.008 | 8.62 | <0.0001 |
| Model 2 (40/575 events) | ||||
| Group (1 vs. 2) | 0.01 | 0.08 | 0.10 | 0.92 |
| Birth weight (1 kg) | −0.15 | 0.04 | −3.93 | <0.0001 |
| Sex (male vs. female) | −0.03 | 0.08 | −0.35 | 0.72 |
| FiO2 prior to extubation × 100 (1 unit) | 0.07 | 0.008 | 9.66 | <0.0001 |
Note: Log transformed, adjusted for sex, fractional inspiratory oxygen (FiO2) prior to extubation, and gestational age (model 1) or birth weight (model 2).