Table 4. Comparison of ODI between the two groups ($\overline{x}\pm s$).

Group	Oswestry disability index				F	P
	Before surgery	1 day after surgery	6 months after surgery	1 year after surgery
PKP Group	87.62±7.26d	49.52±4.96c	31.81±8.45b	24.63±7.14a	455.564	<0.001
S-PKP Group	86.67±6.04d	49.56±4.17c	31.63±7.00b	24.89±5.26a	373.580	<0.001
F	0.324	0.001	0.009	0.026
P	0.571	0.978	0.927	0.872

For the ODI and VAS scores in the last follow-up, a total of four patients in the PKP group were lost to follow-up, a total of three patients in the S-PKP group were lost to follow-up, and the shedding data were treated as missing values.