Table 4: Mean differences from baseline of patient-reported outcomes and radiographic parameters.

Parameter Device 6 Weeks 3 Months 6 Months 12 Months
VAS Back Pain Expandable 4.2 (1.0) 4.9 (1.2) 5.8 (1.2)* 6.5 (1.2)*
Static 4.7 (2.3) 5.1 (2.3) 4.3 (2.9) 5.1 (2.6)
ODI Expandable 29.9 (13.1) 42.6 (12.2)* 52.4 (13.5)* 61.1 (11.9)*
Static 24.3 (24.4) 28.8 (20.6) 26.8 (22.6) 29.8 (23.4)
Middle Disc Height (mm) Expandable 5.9 (2.4)* 5.3 (2.3)* 5.0 (2.3) 4.7 (2.4)
Static 4.6 (2.8) 4.1 (3.1) 4.2 (3.0) 3.9 (3.2)
Neuroforaminal Height (mm) Expandable 5.9 (3.9)* 5.4 (4.0)* 4.4 (4.0)* 3.7 (3.9)
Static 2.5 (3.5) 2.3 (3.9) 1.8 (3.3) 2.2 (4.3)
Segmental Lordosis (°) Expandable 4.8 (3.3)* 4.4 (3.1)* 4.1 (3.1)* 3.8 (2.9)*
Static 0.6 (5.1) 0.3 (5.1) 0.2 (5.6) -0.3 (4.6)

*P<0.05 compared to static. Mean (SD).