Table 3.

Comparisons of the Improvement of Patient-Reported Outcomes At 1-year follow-up After Case–Control Matching

Variable	FI > 25% (n = 160)	FI < 25% (n = 160)	P value
At 1-Year Follow-Up
VAS for back pain	3.2 ± 2.3	2.8 ± 2.2	0.017*
VAS for leg pain	2.8 ± 2.4	2.3 ± 2.5	0.039*
ODI	21.7 ± 15.1	17.1 ± 14.1	0.010*
Change
Change of VAS for back pain	2.5 ± 2.7	2.5 ± 2.9	0.527
Change of VAS for leg pain	3.2 ± 3.0	3.7 ± 3.5	0.212
Change of ODI	17.9 ± 17.7	21.0 ± 23.0	0.549
Rates of CSI
Improvement rate of VAS for back pain ≥ 50%	69:66	55:60	0.913
Improvement rate of VAS for leg pain ≥ 50%	55:76	34:79	0.548
Improvement rate of ODI ≥ 40%	56:79	47:76	0.879

The numbers in bold represented that there was significant difference between the two groups

*P < 0.05, **P < 0.01