Table:
Preoperative	Postoperative	Difference	p-value
RA	base	- 11 ± 3	- 5 ± 2	6 ± 3	<0.001
mid	- 10 ± 3	- 4 ± 2	6 ± 3	<0.001
IAS	base	- 7 ± 2	- 6 ± 2	1 ± 2	<0.001
mid	- 7 ± 2	- 5 ± 2	2 ± 2	<0.001
LA lat	base	- 8 ± 2	- 6 ± 2	2 ± 2	<0.001
mid	- 8 ± 3	- 5 ± 2	3 ± 2	<0.001
LA post	base	- 8 ± 2	- 6 ± 2	2 ± 2	0.002
mid	- 6 ± 2	- 4 ± 1	2 ± 3	<0.001

Parse the following content of the image in markdown code: |  |  | Preoperative | Postoperative | Difference | p-value | 
 | --- | --- | --- | --- | --- | --- | 
 | <ROWSPAN=2> RA | base | - 11 ± 3 | - 5 ± 2 | 6 ± 3 | <0.001 | 
 | mid | - 10 ± 3 | - 4 ± 2 | 6 ± 3 | <0.001 | 
 | <ROWSPAN=2> IAS | base | - 7 ± 2 | - 6 ± 2 | 1 ± 2 | <0.001 | 
 | mid | - 7 ± 2

| - 5 ± 2 | 2 ± 2 | <0.001 | 
 | <ROWSPAN=2> LA lat | base | - 8 ± 2 | - 6 ± 2 | 2 ± 2 | <0.001 | 
 | mid | - 8 ± 3 | - 5 ± 2 | 3 ± 2 | <0.001 | 
 | LA post | base | - 8 ± 2 | - 6 ± 2 | 2 ± 2 | 0.002 | 
 |  | mid | - 6 ± 2 | - 4 ± 1 | 2 ± 3 | <0.001 |