Table 2.

Postoperative data

	DS group	Non-DS group	p value
Lordotic angle (o)	17.1 ± 11.6	13.8 ± 17.5	0.54
ROM of cervical spine (o)	29.6 ± 12.0	25.5 ± 13.2	0.37
Rate of ROM reduction (%)a	29.2 ± 16.1	19.9 ± 46.6	0.47
JOA score	10.9 ± 3.3	11.9 ± 2.8	0.35
Recovery rate (%)	42.4 ± 21.2	50.3 ± 18.9	0.27

^aRate of ROM reduction = (preoperative ROM − postoperative ROM)/preoperative ROM × 100 (%)