A significant difference was found between groups for the ODI score after 4 weeks ( between-group difference , -3.5 [ 95 % CI , -6.8 to -0.08 ] , P = .045 ] ) , but not at 1-year follow-up ( between-group difference , -2.0 [ 95 % CI , -5.0 to 1.0 ] , P = .19 ) .