Table 2.

Intensity of pain measured using the VAS scale before surgery (preop) and 6 months after surgery (postop).

			Paired differences
				95% Confidence interval
Paired samples	N	Mean	Mean	Lower	Upper	Sig. (two-tailed)
Preop radicular pain	258	7.47
			3.05	2.65	3.45	0.000
Postop radicular pain	258	4.42
Preop neck pain	255	6.45
			2.30	1.90	2.71	0.000
Postop neck pain	255	4.15
Preop headache	254	3.63
			0.55	0.22	0.89	0.001
Postop headache	254	3.08

(Paired sample t-test).