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Table 4 Prognostic variables in subgroup analysis

From: Effectiveness of percutaneous laser disc decompression versus conventional open discectomy in the treatment of lumbar disc herniation; design of a prospective randomized controlled trial

Demographic variables:
   *Age < 40 years versus > 40 years
   *Higher education versus lower education
   *Non-physical versus physically demanding jobs
Anamnestic variables and neurological variables
   *Quetelet index < 25 versus > 25
   *Influence of sitting on complaints versus no influence
   *Straight leg raising < 30° versus low-back pain
MRI variables
   *Median versus mediolateral and lateral herniation
   *High disc space versus low disc space
   *Higher signal versus lower signal of disc on T2 weighted images
   *Bud-herniation versus broad based herniation