Reader variability::B reader


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Reader variability Inter-reader variability occurs when readers disagree amongst themselves on a classification. Intra-reader variability occurs when a reader classifies a radiograph differently on different occasions. Reader variability was one of the factors prompting the ILO to develop the ILO Classification system and was a catalyst for NIOSH's development of the "B" reader program.

NIOSH notes that when excessive, reader variability can reduce the quality and utility of the data.<ref name="NIOSH variability">[1]|NIOSH Issues in Classification of Chest Radiographs</ref> Inter-reader variability can be random or systematic. Systematic variation between readers, in which one reader consistently reports more or less abnormality than another, is related to bias, according to NIOSH.<ref name="NIOSH variability"/> Bias can occur when a reader has information concerning the radiograph being classified (including information regarding the worker, such as exposure), by consciously or unconsciously influencing their classification. In a study comparing interpretations by "B" readers retained by lawyers in asbestos litigation compared to those from an independent blinded panel of "B" readers, there was an exceptionally high rate of disagreement (95.9% positive versus 4.5% positive, respectively).<ref>Gitlin JN, Cook LL, Linton OW, Garrett-Mayer E. Comparison of "B" Readers' Interpretations of Chest Radiographs for Asbestos Related Changes. Acad Radiol, 2004;11:843-856.</ref>

B reader sections
Intro  History  Objectives of the \"B\" reader program  Certified \"B\" readers  Reader variability  NIOSH Code of Ethics for \"B\" readers  Recommended practices  References  

Reader variability
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