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Table 1 Selection criteria for trial eligibility

From: Cost-effectiveness of decompression according to Gill versus instrumented spondylodesis in the treatment of sciatica due to low grade spondylolytic spondylolisthesis: A prospective randomised controlled trial [NTR1300]

Inclusion criteria:
   • Age 18–70 years
   • Spondylolytic spondylolisthesis grade I or II
   • Persistent sciatica or neurogenic claudication, with or without low back pain, lasting more than 3 months
   • Operation indication
   • Informed consent
Exclusion criteria:
   • Spondylolytic spondylolisthesis grade III or IV
   • Herniated disc on affected level, which requires discectomy
   • Low back pain only
   • Instability on dynamic X-ray (>3 mm)
   • Progressive spondylolisthesis
   • Previous surgery on affected level
   • Extreme obesitas (BMI > 35)
   • Severe osteoporosis/chronic use of steroids
   • Severe comorbidity/contraindication for surgery
   • Planned migration to another country on the short term
   • Inadequate knowledge of Dutch language
   • Pregnancy