Table 3.

Comparison of NRS, ODI and number of drug classes in control and PRF group at T6 and T9. The p value compares the change occurring in the interval T6-T9 in the two groups

	Control group (n=35)		Pulsed radiofrequency (n=9)
	T6	T9	T6	T9	p
Lumbar Pain (NRS)	4.5±1.8	4.4±1.9	5±1.6	1.3±1.1	<0.001
Radicular Pain (NRS)	7.3±1.9	7.2±2.2	9±1.3	2.7±1.7	<0.001
Disability (ODI)	44±11	49±11	53±23	29±14	<0.001
Number of drug classes (*)	4.3±0.9	4.2±1.1	3.8±0.7	1.3±0.7	<0.001

*: number of current therapies in the following classes: anticonvulsants, antidepressants, NSAIDs, opioids, blockades/infiltrations.