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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