OD	open surgery
MED	microendoscopic discectomy
PTED	percutaneous transforaminal discectomy
PLIF	posterior lumbar interbody fusion surgery
TLIF	transforaminal lumbar interbody fusion surgery
MIS-TLIF	minimally invasive transforaminal lumbar interbody fusion surgery
PEID	percutaneous endoscopic interlaminar discectomy
PRISMA	Preferred Reporting Items For Systematic Reviews and Meta-Analyses
RCT	randomized controlled trials
NOS	Newcastle–Ottawa Scale
VAS	visual analogue scale
ODI	Oswestry Disability Index
OR	odds ratio
CI	confidence interval
MD	mean difference
SMD	standard mean difference