Figure 4. Receiver operating characteristic curve. The 45° line represents the point at which the test is no better than chance. The area under the curve measures the performance of the test; the larger the area under the curve, the better the test performance. Adapted from Grover SA, Coupal L, Hu X-P. Identifying adults at increased risk of coronary disease: how well do the current cholesterol guidelines work? JAMA. 1995;274(10):801–806.