Lumbar lordosis and IVDh comparison from supine to prone.
| Variable | Supine Position, Mean (SD) | Prone Position, Mean (SD) | Paired Difference (95% CI) | P |
| Lumbar lordosis (°) | 49.3 (9.3) | 52.1 (10.0) | −2.8 (−4.7, −0.9) | 0.005 |
| Lower lumbar lordosis (°) | 36.9 (6.0) | 36.4 (6.5) | 0.5 (−0.7, 1.7) | 0.404 |
| L3−L4 anterior IVDh (mm) | 9.3 (1.6) | 9.7 (1.5) | −0.3 (−0.6, −0.1) | 0.015 |
| L3−L4 middle IVDh (mm) | 10.2 (2.1) | 10.4 (1.9) | −0.2 (−0.5, 0.0) | 0.101 |
| L3−L4 posterior IVDh (mm) | 6.5 (1.5) | 6.5 (1.5) | 0.0 (−0.3, 0.2) | 0.800 |
| L4−L5 anterior IVDh (mm) | 10.2 (2.2) | 10.4 (2.0) | −0.2 (−0.5, 0.1) | 0.142 |
| L4−L5 middle IVDh (mm) | 10.2 (2.3) | 10.2 (2.1) | 0.0 (−0.2, 0.0) | 0.914 |
| L4−L5 posterior IVDh (mm) | 6.0 (1.5) | 6.3 (1.5) | −0.3 (−0.6, −0.1] | 0.353 |
| L5−S1 anterior IVDh (mm) | 11.7 (2.9) | 11.7 (2.7) | 0.0 (−0.4, 0.4) | 1.000 |
| L5−S1 middle IVDh (mm) | 9.2 (2.7) | 9.2 (2.9) | 0.0 (−0.3, 0.3) | 0.876 |
| L5−S1 posterior IVDh (mm) | 5.1 (1.3) | 5.4 (1.7) | −0.3 (−0.6, 0.0) | 0.032 |
Abbreviations: CI, confidence interval; IVDh, intervertebral disc height.