Fig. 2From: The use of electronic healthcare records for colorectal cancer screening referral decisions and risk prediction model developmentPPV and NPV for different thresholds of risk for the prediction model applied to those with negative results and with two year follow up. A PPV of 3% corresponds to a risk probability threshold of 0.0168. The plot displays the locally weighted regression lines of PPV and NPV against the risk probability determined from the modelBack to article page