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Table 3 Selected prognostic variables for subgroup analysis.

From: Cost-effectiveness of microendoscopic discectomy versus conventional open discectomy in the treatment of lumbar disc herniation: a prospective randomised controlled trial [ISRCTN51857546]

Demographic variables:
   • Age < 40 years versus > 40 years
   • Non-physical versus physical demanding jobs
Anamnestic and neurological variables:
   • Influence of sitting on complaints versus no influenec
   • Quetelet index < 25 versus > 25
   • Straight leg raising < 30° without back pain versus with back pain
Radiological variables:
   • MRI disc sequester versus contained disc herniation
   • Median versus mediolateral and lateral disc herniation
   • High versus low height of disc level