Table 2.

VAS and ODI within-group comparisons.

		Mean ± SD (range)	95% CI	P value
Group A (n = 23)
VAS (0–10)	Paired 1	7.13 ± 0.76 (6–9)	3.713–4.200	<0.001
		3.17 ± 0.65 (2–5)
	Paired 2	3.17 ± 0.65 (2–5)	1.421–2.231	<0.001
		1.35 ± 0.57 (0–2)
ODI (0–100)	Paired 1	77.65 ± 4.58 (68–88)	60.568–63.780	<0.001
		15.48 ± 4.14 (8–22)
	Paired 2	15.48 ± 4.14 (8–22)	2.990–6.923	<0.001
		10.52 ± 3.78 (2–16)
Group B (n = 13)
VAS (0–10)	Paired 1	7.31 ± 0.86 (6–9)	2.992–3.931	<0.001
		3.85 ± 0.56 (3–5)
	Paired 2	3.85 ± 0.56 (3–5)	1.008–2.068	<0.001
		2.31 ± 0.75 (1–3)
ODI (0–100)	Paired 1	75.23 ± 5.75 (64–88)	50.572–58.351	<0.001
		20.77 ± 4.66 (14–28)
	Paired 2	20.77 ± 4.66 (14–28)	2.546–9.454	0.003
		14.77 ± 3.52 (10–20)

Note: paired sample t-test. Paired 1, preoperation was paired with the 2nd day postoperation. Paired 2 and 2nd day postoperation were paired with the last follow-up.