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Calibration plot of the algorithm for severe periodontitis. The algorithm from Verhulst et al. [1] for severe periodontitis is Y = 2.073*Q3 + 1.277*Q4 + 1.590*Q6 + 1.440*Q8 + 1.615*Age + 1.091*Sex. The reference line is what would result if the predicted probability was the same as the actual probability of the model so that the prediction is neither underestimated nor overestimated
