[Retracted] Short-Term Postoperative Pain and Function of Unilateral Biportal Endoscopic Discectomy versus Percutaneous Endoscopic Lumbar Discectomy for Single-Segment Lumbar Disc Herniation: A Systematic Review and Meta-analysis

Table 2

Quality assessment of studies included according to the Newcastle-Ottawa Scale.

Study ID	Selection	Comparability	Exposure/outcome	Total score
Choi 2018	4	1	2	7
Hao 2022	4	2	2	8
Jiang 2022	4	2	2	8
Merter 2022	4	2	2	8