Mean OP measurements for each position and differences in measurements between positions
| Mean OP ± SD (cm H2O) | P Value | |
|---|---|---|
| Prone flat | 15.3 ± 4.8 | |
| Prone tilt | 14.2 ± 5.9 | |
| LD | 12.6 ± 4.8 | |
| Difference between prone flat and prone tilt | 1.1 ± 0.80 | .20 |
| Difference between LD and prone flat | 2.7 ± 0.69 | .001 |
| Difference between LD and prone tilt | 1.6 ± 0.67 | .017 |