Table 4.

Duration of leg pain and outcome measures at 1-year follow-up

Duration of pain pre-operatively	EuroQol-5D	Oswestry disability index	Leg pain	Back pain	Walking distance
Up to 2 years	0.65 (0.24)	25 (17)	31 (29)	31 (30)	2.8 (1.2)
n =	52	36	57	58	62
Over 2 years	0.52 (0.51)	38 (22)	47 (35)	43 (29)	1.1 (1.1)
n =	36	28	41	42	44
p-value	0.01	0.02	0.03	0.05	0.002
95% CI for difference in medians a	–0.04 to 0.34	–24 to 2	–52 to –3	–41 to –0.5	–1 to 1

Two-sample Wilcoxon rank-sum test.

Standard deviation in parentheses.

^a Stratified bootstrap test for difference in medians.