APOE and Alzheimer disease: In the testing set, the AD protein risk score had a C‐index of 0.867 (95% CI, 0.828, 0.906) for AD prediction, followed by CogDrisk‐AD risk factors (C‐index, 0.856; 95% CI, 0.823, 0.889), and APOE genotypes (C‐index, 0.705; 95% CI, 0.660, 0.750).