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Small improvement in the area under the receiver operating characteristic curve indicated small changes in predicted risks.

Abstract：

OBJECTIVE:Adding risk factors to a prediction model often increases the area under the receiver operating characteristic curve (AUC) only slightly, particularly when the AUC of the model was already high. We investigated whether a risk factor that minimally improves the AUC may nevertheless improve the predictive ability of the model, assessed by integrated discrimination improvement (IDI). STUDY DESIGN AND SETTING:We simulated data sets with risk factors and event status for 100,000 hypothetical individuals and created prediction models with AUCs between 0.50 and 0.95. We added a single risk factor for which the effect was modeled as a certain odds ratio (OR 2, 4, 8) or AUC increment (ΔAUC 0.01, 0.02, 0.03). RESULTS:Across all AUC values of the baseline model, for a risk factor with the same OR, both ΔAUC and IDI were lower when the AUC of the baseline model was higher. When the increment in AUC was small (ΔAUC 0.01), the IDI was also small, except when the AUC of the baseline model was >0.90. CONCLUSION:When the addition of a risk factor shows minimal improvement in AUC, predicted risks generally show minimal changes too. Updating risk models with strong risk factors may be informative for a subgroup of individuals, but not at the population level. The AUC may not be as insensitive as is frequently argued.

journal_name

J Clin Epidemiol

journal_title

Journal of clinical epidemiology

authors

Martens FK,Tonk EC,Kers JG,Janssens AC

doi

10.1016/j.jclinepi.2016.07.002

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

159-164

eissn

0895-4356

issn

1878-5921

pii

S0895-4356(16)30194-9

journal_volume

79

pub_type

杂志文章

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