Table 1.

Details of the patients

	AS deformity	AS non-deformity	non-AS deformity
n	94	20	20
Gender, male (%)	89	90	90
age	36.8 ± 9.8	37.5 ± 10.9	40.8 ± 5.1
BMI	25.9 ± 5.3	24.5 ± 3.5	24.6 ± 3.4
GK	69.5 ± 15.9	46.2 ± 17.7*	65.7 ± 14.9
PT	37.7 ± 10.9	24.5 ± 11.2*	28.1 ± 15.4*
SS	6.7 ± 8.4	18.4 ± 8.9*	19.0 ± 11.3*

AS Ankylosing spondylitis, BMI Body mass index, GK Global kyphosis, PT Pelvic tilt, SS Sacral slope

* data was statistically different from that of AS deformity (P < 0.05)