Relationship between root-to-pedicle and foraminal height.
| Variable | Supine Position, Ratio (SD) | Prone Position, Ratio (SD) | Paired Difference (95% CI) | P |
| Left L3−L4 | 0.42 (0.81) | 0.44 (0.90) | −0.02 (−0.05, 0.00) | 0.069 |
| Left L4−L5 | 0.45 (0.81) | 0.45 (0.75) | 0.00 (−0.01, 0.03) | 0.412 |
| Left L5−S1 | 0.47 (0.11) | 0.45 (0.79) | 0.01 (−0.01, 0.04) | 0.311 |
| Right L3−L4 | 0.48 (0.78) | 0.46 (0.68) | 0.02 (−0.01, 0.05) | 0.203 |
| Right L4−L5 | 0.45 (0.81) | 0.45 (0.75) | 0.01 (−0.01, 0.03) | 0.412 |
| Right L5−S1 | 0.49 (0.77) | 0.49 (0.95) | 0.00 (−0.03, 0.03) | 0.984 |