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. 2017 Mar;3(1):16–22. doi: 10.21037/jss.2017.03.04

Table 3. Changes in outcome variables, unilateral fixation group.

Variable PreOp PostOp ∆** P*
1 mo. 3 mos. 6 mos. 12 mos.
ODI 47.33 (±22.34) 28.5 (±9.42) 21.83(±8.63) 15.67(±8.35) 11.5 (±8.14) −35.83 <0.001
VAS leg pain§ 8 (2.0) 2.5 (3.0) 2 (3.0) 1 (2.0) 1 (2.0) −7 <0.001
VAS back pain§ 8 (2.0) 3.5 (4.0) 3 (4.0) 2 (3.0) 1.5 (4.0) −6.5 <0.001
SF-36§ 44.44 (21.26) 52.39 (2.50) 49.89 (13.37) 53.62 (23.73) 62.25 (17.28) +17.81 0.004

, values expressed as mean (± SD); §, median (IQR); **, change from PreOp to 12 mos.; *, Friedman test; mo, month; mos., months.