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Table 1 Evaluation schedule

From: Comparing the efficacy and safety of minimally invasive biportal endoscopic spine surgery versus conventional microscopic discectomy in single-level lumbar herniated intervertebral disc (ENDO-BH Trial): a multicenter, prospective, randomized controlled equivalence trial study protocol

Visit type Screening Operation/treatment Follow-up
Visit 1 2 3 4 5 6
Visit week − 4~0 weeks 0–2 day 2 weeks 12 weeks 24 weeks 52 weeks
   ± 5 days ± 4 weeks ± 8 weeks ± 8 weeks
Informed consent      
Demographics*      
Inclusion/exclusion      
Randomization      
Operation      
MRI (or CT)†     
Simple radiographs  
ODI  
EQ-5D-5L  
VAS  
POSAS    
Other surveys   
Adverse events  
  1. MRI magnetic resonance imaging, CT computed tomography, ODI Oswestry Disability Index, EQ-5D-5L EuroQol 5 Dimension 5 level, VAS visual analog scale, POSAS Patient and Observer Scar Assessment Scale
  2. *Baseline patients’ characteristics including past medical/surgical history, physical examination, and laboratory tests
  3. CT scan is possible when MRI cannot be taken
  4. Including surgery satisfaction, walking time, postoperative return to daily life period