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Interactive worksheet
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Clinical contextWhy this tool matters and how to interpret it
Understand the result,
not just the number.
Integrated Discrimination Improvement (IDI): Explanation and Clinical Context Integrated Discrimination Improvement (IDI) is a metric used to evaluate the improvement in risk prediction offered by a new model compared with a baseline model. It quantifies the change in predicted probabilities for events and non-events, measuring how much better a new model separates patients who experience an event from those who do not. The IDI is particularly useful in cardiovascular risk prediction, model comparison, and assessing incremental value of novel biomarkers or imaging findings.
In practice, a positive IDI indicates improved discrimination, while a negative IDI suggests worse discrimination.
Evidence & references1 primary source mapped
- Source 1
Pencina MJ, D'Agostino RB Sr, D'Agostino RB Jr, Vasan RS. Evaluating the added predictive ability of a new marker: from area under the ROC curve to reclassification and beyond. Stat Med. 2008;27(2):157-172. doi:10.1002/sim.2929
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