Unilateral Biportal Endoscopic Discectomy versus Microendoscopic Discectomy for the Treatment of Lumbar Spinal Stenosis: A Systematic Review and Meta-Analysis

Table 2

Risk of bias of randomized controlled trials.

Study	Random allocation	Hidden distribution	Blind method	Incomplete outcome data	Selective reporting of results	Other bias	Quality level
Kang [26]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	High
Park [30]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	High
Min [29]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	High