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Odds ratios for trends in the performance of additional workups and comparisons of each nodule characteristic, such as an AP/T ratio >1; calcification; and nodule iso-, or hypo-, or heterogeneous attenuation (reference: hyper-attenuation), with each indication for a CT study, including trauma, infection, screening, vascular problem, and other (reference: malignancy). AP/T ratio = ratio of the anteroposterior to transverse dimensions, CT = computed tomography.
