[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 1

Baseline characteristics of the studies included in the meta-analysis.

Study ID	Design	Country	Surgical approach	No. of patients (male/female)		Age (years)		Follow-up (months)		Analysis index
				UBE	PELD	UBE	PELD	UBE	PELD
Choi 2018	Prospectively	Korea	UBE vs. PELD	20 (10/10)	20 (11/9)			>1	>1	①②③④
Hao 2022	Retrospectively	China	UBE vs. PELD	20 (14/6)	20 (8/12)			>6	>6	①②③④⑤
Jiang 2022	Retrospectively	China	UBE vs. PELD	24 (10/14)	30 (13/17)					①②③④⑤
Merter 2022	Prospectively	Turkey	UBE vs. PELD	25 (14/11)	25 (16/9)	46.04	44.76	NA	NA	①

① Operation time. ② VAS of back pain (preoperative/POD 3/POD 30). ③ VAS of leg pain (preoperative/POD 3/POD 30). ④ ODI (preoperative/POD 30). ⑤ Complications. UBE: unilateral biportal endoscopy; PELD: percutaneous endoscopic lumbar discectomy; NA: not available.