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Mean predicted rates of acute esophagitis versus observed rates for patients. The patients were binned in accordance with the predicted risk of acute esophagitis by the best fit two-variable model. The mean predicted and observed event rates in each bin are (predicted risk; events/pts): (0.5059, 10/20), (0.7504, 14/19), (0.8465, 17/19), (0.9034, 18/19), (0.9419, 18/19), (0.9715, 17/19).
