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