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Table 2: Pain-with-activity VAS (0–10) in the thoracic and lumbar levels in each period of preoperative pain
≤6 Weeks 6–24 Weeks >24 Weeks
Thoracic Lumbar P Thoracic Lumbar P Thoracic Lumbar P
No. 72 80 57 66 22 24 
Preoperative 8.3 (2.0) 8.3 (2.0) .87 7.9 (2.1) 8.1 (2.0) .49 7.8 (1.9) 7.9 (1.8) .81
Postoperative 3.6 (2.6) 3.1 (2.9) .42 3.3 (3.2) 3.3 (3.3) .96 1.6 (1.8) 2.5 (2.7) .33
1 Week post 4.4 (3.1) 4.0 (2.9) .47 4.4 (3.2) 3.6 (2.7) .17 2.8 (2.2) 3.9 (3.4) .21
1 Month post 3.4 (3.2) 3.8 (3.0) .54 4.7 (2.7) 3.7 (2.9) .09 4.2 (2.8) 4.8 (3.5) .59
6 Months post 3.2 (3.2) 2.3 (2.6) .12 3.0 (2.9) 3.4 (3.3) .50 3.9 (4.0) 4.8 (3.6) .52
1 Year post 3.1 (3.2) 3.0 (3.1) .88 4.7 (3.4) 3.0 (3.2) .05 5.0 (3.9) 5.1 (3.6) .95

	≤6 Weeks			6–24 Weeks			>24 Weeks
	Thoracic	Lumbar	P	Thoracic	Lumbar	P	Thoracic	Lumbar	P
No.	72	80		57	66		22	24
Preoperative	8.3 (2.0)	8.3 (2.0)	.87	7.9 (2.1)	8.1 (2.0)	.49	7.8 (1.9)	7.9 (1.8)	.81
Postoperative	3.6 (2.6)	3.1 (2.9)	.42	3.3 (3.2)	3.3 (3.3)	.96	1.6 (1.8)	2.5 (2.7)	.33
1 Week post	4.4 (3.1)	4.0 (2.9)	.47	4.4 (3.2)	3.6 (2.7)	.17	2.8 (2.2)	3.9 (3.4)	.21
1 Month post	3.4 (3.2)	3.8 (3.0)	.54	4.7 (2.7)	3.7 (2.9)	.09	4.2 (2.8)	4.8 (3.5)	.59
6 Months post	3.2 (3.2)	2.3 (2.6)	.12	3.0 (2.9)	3.4 (3.3)	.50	3.9 (4.0)	4.8 (3.6)	.52
1 Year post	3.1 (3.2)	3.0 (3.1)	.88	4.7 (3.4)	3.0 (3.2)	.05	5.0 (3.9)	5.1 (3.6)	.95