Would loss to follow-up bias the outcome evaluation of patients operated for degenerative disorders of the lumbar spine?

A study of responding and non-responding cohort participants from a clinical spine surgery registry

Tore K Solberg Department of Neurosurgery, University Hospital of Northern Norway, Tromsø; Norwegian Registry for Spine Surgery (NORspine), Northern Norway Regional Health Authority, TromsøCorrespondence[email protected]

Andreas Sørlie Department of Neurosurgery, University Hospital of Northern Norway, Tromsø; Norwegian Registry for Spine Surgery (NORspine), Northern Norway Regional Health Authority, Tromsø

Kristin Sjaavik Department of Neurosurgery, University Hospital of Northern Norway, Tromsø; Norwegian Registry for Spine Surgery (NORspine), Northern Norway Regional Health Authority, Tromsø

Øystein P Nygaard Norwegian Registry for Spine Surgery (NORspine), Northern Norway Regional Health Authority, Tromsø; National Centre for Spinal Disorders and Department of Neurosurgery, University Hospital of St. Olav, Trondheim

Tor Ingebrigtsen Department of Neurosurgery, University Hospital of Northern Norway, Tromsø; Institute of Clinical Medicine, University of Tromsø, Norway

Would loss to follow-up bias the outcome evaluation of patients operated for degenerative disorders of the lumbar spine?

A study of responding and non-responding cohort participants from a clinical spine surgery registry

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Would loss to follow-up bias the outcome evaluation of patients operated for degenerative disorders of the lumbar spine?

A study of responding and non-responding cohort participants from a clinical spine surgery registry

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