Abstract
Experienced radiologists and chest specialists have been shown to vary considerably in their interpretation of selected and unselected groups of survey chest films, irrespective of the size of the film. 1 They have been shown to disagree with each other and with themselves to a significant degree on rereading of such films. phenomenon of experienced reader variation is not confined solely to chest roentgenology; it exists in most fields in which scientific tests have been made, medical, chemical, mathematical, and otherwise. 2 The first reaction of experienced persons on reading reports of this error factor is to comment, This does not happen to me in my work. However, when such persons submit themselves to critical and competent testing, they soon find that they also are subject to similar variations. The discovery of this fact leads (or has led in our own experience) to more careful analyses of subsequent films,
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