Table 2.

Influence of different factors on duration of success (50% reduction in pain as compared to baseline), expressed in weeks

Factor	Hazard ratio	95% CI	p value
Female	1.71	0.86, 3.4	0.12
Age (years)	1.00	0.97, 1.04	0.94
Pain duration (years)	1.00	0.96, 1.03	0.94
Number of treated joints	1.95	1.14, 3.33	0.02
Previous surgery (vs. no surgery)	2.39	1.09, 5.21	0.03
Opioid use (vs. no use)	1.44	0.72, 2.89	0.30
Radiating pain	1.22	0.60, 2.49	0.58
Work inability >50%	1.96	0.82, 4.68	0.13
Depression (BDI > 16)	2.97	1.32, 6.65	0.01

Age, pain duration, and number of joints were included as continuous covariates with the hazard ratio relating to an increase of one unit