Table 3: Demographic, clinical, procedural and outcome characteristics in patients who experienced =50% functional improvement compared to patients with < 50% functional improvement at long-term follow up (n=55 total patients).

	≥50% patient perceived functional improvement (n=32) Median (IQR) or n (%)	< 50% patient perceived functional improvement (n=23) Median (IQR) or n (%)	P value
Age (years)	43 (33, 53)	44 (39, 53)	0.43
Sex Male Female	10 (31%) 22 (69%)	16 (70%) 7 (30%)	0.01
BMI (Kg/m2)	25 (22, 30)	27 (23, 30)	0.63
Duration of pain at presentation < 2 years 2-5 years >5 years	14 (44%) 10 (31%) 8 (25%)	11 (48%) 8 (35%) 4 (17%)	0.79
Number of diagnostic MBB blocks 1 2	14 (44%) 18 (56%)	13 (57%) 10 (43%)	0.42
Number of facet joint levels denervated 1 2 3	6 (19%) 15 (47%) 11 (34%)	10 (43%) 10 (43%) 3 (14%)	0.07
Bilateral procedures	14 (44%)	11 (48%)	0.38
Repeat RFA	13 (46%)	2 (9%)	< 0.01
Duration between procedure and follow up (months)	36 (16, 63)	39 (16, 54)	0.47
Baseline NRS pain score	7 (5, 8)	6 (5, 8)	0.47
Reduction in NRS pain score	3 (1, 7)	1 (0, 2)	< 0.01
≥50% reduction in pain	26 (87%)	4 (17%)	< 0.01
Baseline Morphine eq	10 (0, 10)	10 (0, 26)	0.11
Reduction in Morphine eq	2.5 (0, 10)	0.0 (0, 5)	0.72
Baseline MQS III score	11.2 (6.8, 16.4)	10.6 (5.6, 14.8)	0.78
Reduction in MQS III score	4.8 (0, 11.1)	0.0 (-7.6, 4.5)	0.17

BMI: Body Mass Index, CI: Confidence Interval, Eq: Equivalents, IQR: Interquartile Range, MBB: Medial Branch Block, MQS III score: Medication Quantification scale III Score, NRS: Numerical Rating Scale, RFA: Radio Frequency Ablation