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Handling of missing items in the Oswestry disability index and the neck disability index: A study from Swespine, the National Swedish spine register
Örebro University, School of Medical Sciences. Department of Orthopedics, Örebro University Hospital, Örebro.ORCID iD: 0000-0002-7931-9617
The National Swedish Spine Register (Swespine), Jonköping, Sweden; Futurum Academy for Health and Care, Länssjukhuset Ryhov, Jönköping, Sweden; Stockholm Center for Spine Surgery (RKC), Stockholm, Sweden.
The National Swedish Spine Register (Swespine), Jönköping, Sweden; Spine Center Göteborg, Gothenburg, Sweden .
2022 (English)In: European spine journal, ISSN 0940-6719, E-ISSN 1432-0932, Vol. 31, no 12, p. 3484-3491Article in journal (Refereed) Published
Abstract [en]

PURPOSE: The Oswestry Disability Index (ODI) and the Neck Disability Index (NDI) scoring algorithms used by the Swedish spine register (Swespine) until April 2022 handled missing items somewhat differently than the original algorithms. The purpose of the current study was to evaluate possible differences in the ODI and NDI scores between the Swespine and the original scoring algorithms.

METHODS: Patients surgically treated for degenerative conditions of the lumbar or cervical spine between 2003-2019 (lumbar) and 2006-2019 (cervical) were identified in Swespine. Preoperative and 1-year postoperative ODI/NDI data were used to evaluate differences between the Swespine and the original ODI/NDI algorithms with adjustment for at most 1 or 2 missing items using mean imputation.

RESULTS: The preoperative as well as the 1-year postoperative ODI/NDI were approximately 1 unit out of 100 smaller for the Swespine algorithm, irrespective of adjustment model. The differences between preoperative and postoperative ODI/NDI scores were similar between the Swespine and the original scoring algorithms. There were occasional statistically significant differences between the preoperative-postoperative differences due to large sample sizes.

CONCLUSIONS: The Swespine algorithms, used until April 2022, underestimated the ODI and NDI by approximately 1 out of 100 units compared with the original algorithms. In addition, there were no statistically significant differences between the original algorithms when adjusting for at most 1 or 2 missing items. The algorithm has now been changed, also for historical data.

Place, publisher, year, edition, pages
Springer, 2022. Vol. 31, no 12, p. 3484-3491
Keywords [en]
Missing items, Neck disability index, Oswestry Disability Index, Swespine
National Category
Orthopaedics
Identifiers
URN: urn:nbn:se:oru:diva-101902DOI: 10.1007/s00586-022-07425-2ISI: 000871174200001PubMedID: 36271985Scopus ID: 2-s2.0-85140448466OAI: oai:DiVA.org:oru-101902DiVA, id: diva2:1705528
Funder
Örebro UniversityAvailable from: 2022-10-24 Created: 2022-10-24 Last updated: 2022-12-19Bibliographically approved

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