Efficacy and Safety of Ultrasound-Guided Radiofrequency Treatment for Chronic Pain in Patients with Knee Osteoarthritis: A Systematic Review and Meta-Analysis

Table 6

The sources of between-study heterogeneity on pain intensity by metaregression analysis.

Subgroup	Q-value	df	value	Proportion of variance by covariate
Age	0.68	1	0.411	0.02
Gender (ratio)	0.30	1	0.586	0
Study design	3.59	2	0.166	0.37
Treatment target	21.82	2	<0.001	0.74
Diagnosis nerve block (DNB)	0.03	1	0.857	0
Follow-up time	0.19	2	0.911	0