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Table 3 Selected prognostic variables for subgroup analysis

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]

Demographic variables:
   • Women versus men
   • Age < 40 years versus > 40 years
   • Smoking versus non-smoking
Anamnestic and neurological variables:
   • Influence of back extension versus no influence
   • Predominant low back pain versus leg pain
   • Quetelet index < 25 versus > 25
Radiological variables:
   • Low disc height versus high disc height
   • Nerve root compression underneath pseudojoint versus nerve root compression between pedicle and slipped disc
   • Grade I versus grade II spondylolytic spondylolisthesis
   • Small cross section versus large cross section of neuroforamen
   • Low grade versus high grade epidural fat