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Calibration (part A) and discrimination (part B) of a risk score designed to identify patients at risk of human immunodeficiency virus (HIV) infection, Denver, Colorado, 1996–2008 and Cincinnati, Ohio, 1998--2010. The area under the receiver operating characteristic curve was 0.85 (95% confidence interval: 0.83, 0.88) in the derivation sample and 0.75 (95% confidence interval: 0.70, 0.78) in the validation sample.
