Table 5

Patient ODI scores by timepoint.

	ODI
Foraminal Stenosis Type	Preoperative	Postoperative 1 mo	Postoperative 6 mo	Postoperative 12 mo	Postoperative 24 mo	P
Stable type I	64.20 ± 13.10	39.90 ± 10.08	35.52 ± 8.38	14.20 ± 5.42	7.12 ± 3.54	<0.001
Stable type II	56.50 ± 15.20	44.13 ± 12.04	35.90 ± 7.40	15.2 ± 4.68	8.22 ± 3.58	<0.001
Stable type III	62.10 ± 12.16	32.16 ± 9.26	24.12 ± 6.60	13.90 ± 5.04	6.80 ± 2.98	<0.001
Stable type IV	55.40 ± 14.80	43.20 ± 10.80	32.10 ± 7.92	16.10 ± 4.98	8.60 ± 2.50	<0.001
Unstable type I	59.60 ± 11.92	42.25 ± 8.84	27.10 ± 7.88	14.05 ± 5.16	8.12 ± 3.24	<0.001
Unstable type II	62.7 ± 16.26	35.32 ± 9.68	32.16 ± 7.54	11.90 ± 4.30	8.80 ± 3.02	<0.001
Unstable type III	54.10 ± 13.84	39.15 ± 8.26	33.95 ± 6.12	8.62 ± 4.72	12.25 ± 3.90	<0.001
Unstable type IV	73.00 ± 6.12	37.25 ± 9.02	28.60 ± 7.96	14.20 ± 6.54	8.50 ± 4.00	<0.001

Note: Data provided as mean ± SD. P value shows statistical significance between preoperative ODI and ODI 24 mo after surgery.
ODI, Oswestry Disability Index.