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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