Table 3

- Correlation analysis of the possible factors related to significant pain relief.

Variables	Spearman’s rho	Age	Gender	BMI	Duration pain	Grade of FJO	Significant pain relief at the 1^st month	Significant pain relief at the 6^th month	Significant pain relief at the 12^th month
Age	Rho	1.000	0.125	0.200	0.056	0.353	0.208	0.053	-0.112
Age	P-value	0.00	0.239	0.058	0.600	0.001	0.058	0.620	0.291
Gender	Rho	0.125	1.000	-0.232	0.054	-0.156	0.141	0.076	0.004
Gender	P-value	0.239	0.00	0.027	0.612	0.140	0.182	0.476	0.970
BMI	Rho	0.200	-0.232*	1.000	-0.130	0.277	-0.163	-0.058	0.132
BMI	P-value	0.058	0.027	0.00	0.218	0.008	0.123	0.586	0.212
Duration of pain	Rho	0.056	0.054	-0.130	1.000	0.085	0.022	-0.025	0.001
	P-value	0.600	0.612	0.218	0.00	0.421	0.838	0.815	0.994
	P-value	0.612	0.209	0.006	0.556	0.208	0.954	0.537	0.876
Grade of FJO	Rho	0.353	-0.156	0.277	0.085	1.000	-0.080	-0.103	0.187
Grade of FJO	P-value	0.001	0.140	0.008	0.421	0.00	0.450	0.332	0.077

BMI: body mass index, FJO: facet joint osteoarthritis