From: The role of preoperative pulmonary function tests in the surgical treatment of extremely severe scoliosis
Preoperative PFTs
Pulmonary complication
χ 2
P
Yes
No
FVC ratio
≤65%
7
17
4.581
0.032
>65%
2
34
FEV1 ratio
6
15
3.173
0.075
3
36
PEF ratio
5
10
3.529
0.060
4
41