(Stroke. 2003;34:1907.)
© 2003 American Heart Association, Inc.
Original Contributions |
From the Department of Neurology and Alzheimer Center (E.C.W. van S., P.S., M.C.V, H.C.W.), Department of Clinical Epidemiology and Biostatistics (D.L.K.), and Department of Radiology and Image Analysis Center (G.K., F.B.), VU Medical Center, Amsterdam, the Netherlands; Department of Radiology, LUMC, Leiden, the Netherlands (M.A. van B.); Department of Epidemiology and Biostatistics, Erasmus Medical Center, Rotterdam, the Netherlands (E.J. van D., N.D.P.); Department of Radiology, University Hospital, Maastricht, the Netherlands (P.A.M.H.); Department of Radiology, National University Hospital, Reykjavik, Iceland (O.K.); Department of Neurology, University Medical Center, Utrecht, the Netherlands (F.-E. de L.); Department of Neurology, Karl Franzens University, Graz, Austria (R.S.); and Department of Neurology, St Lucas/Andreas Ziekenhuis, Amsterdam, the Netherlands (H.C.W.).
Correspondence to E.C.W. van Straaten, Department of Neurology and Alzheimer Center, VU Medical Center, De Boelelaan 1117, PO Box 7057, 1007 MB Amsterdam, Netherlands. E-mail i.vanstraaten{at}vumc.nl
Background and Purpose Vascular dementia (VaD) is thought to be the most common cause of dementia after Alzheimers disease. The commonly used International Workshop of the National Institute of Neurological Disorders and Stroke (NINDS) and the Association Internationale pour la Recherche et lEnseignement en Neurosciences (AIREN) criteria for VaD necessitate evidence of vascular disease on CT or MRI of the brain. The purposes of our study were to operationalize the radiological part of the NINDS-AIREN criteria and to assess the effect of this operationalization on interobserver agreement.
Methods Six experienced and 4 inexperienced observers rated a set of 40 MRI studies of patients with clinically suspected VaD twice using the NINDS-AIREN set of radiological criteria. After the first reading session, operational definitions were conceived, which were subsequently used in the second reading session. Interobserver reproducibility was measured by Cohens
.
Results Overall agreement at the first reading session was poor (
=0.29) and improved slightly after application of the additional definitions (
=0.38). Raters in the experienced group improved their agreement from almost moderate (
=0.39) to good (0.62). The inexperienced group started out with poor agreement (
=0.17) and did not improve (
=0.18). The experienced group improved in both the large- and small-vessel categories, whereas the inexperienced group improved generally in the extensive white matter hyperintensities categories.
Conclusions Considerable interobserver variability exists for the assessment of the radiological part of the NINDS-AIREN criteria. Use of operational definitions improves agreement but only for already experienced observers.
Key Words: dementia magnetic resonance imaging observer variation vascular disorders
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