Table 4.

Change scores and their differences (“No durotomy” minus “durotomy”) for SF- 36 scores, Oswestry disability index scores and Stenosis bothersome index scores, according to status of durotomy.

	3-month		1-year		2-year		3-year		4-year
	Difference† (95% CI)	p-value	Difference† (95% CI)	p-value	Difference† (95% CI)	p-value	Difference† (95% CI)	p-value	Difference† (95% CI)	p-value	AUC p-value
SF-36 Bodily Pain (SE)‡	−2.4 (−11.7, 6.9)	0.61	−8.2 (−18, 1.7)	0.10	−7.2 (−18.2, 3.8)	0.20	−2 (−11.4, 7.4)	0.68	−7 (−19.8, 5.8)	0.28	0.13
SF-36 Physical Function (SE)‡	−0.9 (−10, 8.3)	0.86	−6.3 (−13.1, 6.2)	0.49	−4.7 (−15.4, 5.9)	0.38	−2.2 (−11.4, 7.1)	0.65	−4.4 (−16.7, 7.9)	0.48	0.45
SF-36 Mental Component Summary (SE)‡	−2.7 (−6.6, 1.1)	0.16	−1.8 (−5.9, 2.2)	0.38	−2.7 (−7.3, 1.8)	0.24	0.2 (−3.7, 4.1)	0.92	0.5 (−4.8, 5.8)	0.86	0.40
Oswestry Disability Index (SE)§	2.8 (−4.5, 10.1)	0.46	2.7 (−5.1, 10.4)	0.50	2.6 (−5.9, 11)	0.55	−0.4 (−7.7, 7)	0.92	5.5 (−4.2, 15.3)	0.27	0.38
Stenosis Bothersomeness Index (SE)¶	1 (−2, 3.9)	0.53	0.7 (−1.8, 3.2)	0.58	1.5 (−1.4, 4.3)	0.31	1.2 (−1.3, 3.6)	0.36	2.5 (−0.7, 5.7)	0.12	0.22

* Adjusted for age, gender, BMI and baseline score.

^†Difference is the difference between no durotomy group mean change from baseline and had durotomy group mean change from baseline.

^‡The SF-36 scores range from 0 to 100, with higher score indicating less severe symptoms.

^§The Oswestry Disability Index ranges from 0 to 100, with lower scores indicating less severe symptoms

^¶The Stenosis Bothersomeness Index ranges from 0 to 24, with lower scores indicating less severe symptoms