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Boxplots of the pharyngeal barium residue by the age at the examination. The pharyngeal barium residue increased with the age at the examination when we used the IS method (B), which measures the residue after initial swallowing, but not when we used the MS method (A), which measures the residue after piecemeal deglutition, or the modified IS method (C), which excludes the data from patients whose residue is >50% when using the IS method.
