Methods, systems, and apparatus to determine the presence of a disease condition in a medical patient by evaluating conductivity information. In some embodiments, point-attributes values may be obtained from conductivity data sets. This data may be compared to previously determined data, such as threshold values. In some embodiments, z-scores may be determined to combine a plurality of point-attribute values in formulation of a composite score for a patient. In some embodiments, z-scores may be weighted by overall accuracy of the point-attribute in predicting presence of the disease.