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Subgroups
| Subgroups | Variables |
|---|---|
| Demographics | age < 70 years versus > 70 years |
| women versus men | |
| Anamnestic and neurological variables | short versus long history of back pain |
| more leg pain versus more back pain | |
| Radiological variables | soft versus bony stenosis |
| extent of stenosis during MRI examination |
Subgroups bases on the following variables.
