Comparison of the Full and Brief Clinical AD Prediction Indexes.

The predicted (solid lines) and observed (dashed lines) are shown as a function of risk score values based on the previously published full index (light grey lines) and brief clinical index (dark grey lines). Prognostic accuracy was significantly higher for the full index (optimism corrected Harrell's c, 0.74) than the brief clinical index (0.71). However, the plot shows good concordance between observed and predicted risk for both indices.