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Schatzki Ring, Statistically Reexamined¹

¹ From the Departments of Clinical Pharmacology and Biostatistics (J.C.P.) and Radiology (A.M.L.), Georgetown University, Washington, DC. Received September 9, 2002; revision requested October 28; revision received November 13; accepted January 6, 2003. Address correspondence to J.C.P., 1711 Liggins Ave, Kissimmee, FL 34744-4091 (e-mail: johnp71@aol.com).

View larger version (49K): [in a new window]   Figure 1. Original histogram of Schatzki that summarizes his ring diameter measurements. = multiple episodes, = single episode, = asymptomatic patients. (Reprinted, with permission, from reference 7.)

View larger version (21K): [in a new window]   Figure 2. ROC curve, derived from the original histogram of Schatzki, shows the sensitivity and specificity that result from any specific choice of cutoff for ring diameter as a predictor of dysphagia.