Regional anesthesia did not improve postoperative long-term survival of tumor patients: a systematic review and meta-analysis of randomized controlled trials

Table 2 Meta-regression for RFS and OS

RFS	R²	P value	OS	tau²	R²	P value
Regional anesthesia	NA	> 0.05	Regional anesthesia	0.40	− 49.77%	> 0.05
Local anesthetic	NA	> 0.05	Local anesthetic	0.13	37.15%	> 0.05
Regional analgesia	NA	> 0.05	Regional analgesia	0.18	34.91%	> 0.05
Follow up	NA	> 0.05	Follow up	0.35	− 30.34%	> 0.05
Tumor	NA	> 0.05	Tumor	0.17	36.08%	> 0.05
Mean age	NA	> 0.05	Mean age	0.39	− 44.95%	> 0.05
Gender	NA	> 0.05	Gender	0.28	− 6.81%	> 0.05

RFS recurrence-free survival, OS overall survival, tau² estimated amount of residual heterogeneity, R² amount of heterogeneity accounted for, NA not analysis

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