Univariate risk factors for T. cruzi seropositivity in children aged 18 years and younger in the community of Guadalupe, Arequipa, Peru, 2005

*The area under the ROC curve is presented as a percent of the total possible area to avoid confusion with odds ratios; a value of 50% is expected by chance, higher values indicate positive association with confirmed diagnosis, lower values indicate negative association. The area under the curve is equivalent to the Wilcoxon rank sum statistic (also know as the Mann-Whitney U statistic), and p-values for associations between continuous variables and confirmed diagnosis are estimated by the Wilcoxon rank sum test.

ROC曲线下面积（area under the ROC curve）以总可能面积的百分比形式呈现，以避免与比值比（odds ratios）产生混淆。随机机遇下的基准取值为50%，取值越高则与确诊结果的正相关性越强，取值越低则表明与确诊结果呈负相关。曲线下面积等价于Wilcoxon秩和统计量（Wilcoxon rank sum statistic，亦称曼-惠特尼U统计量（Mann-Whitney U statistic）），连续变量与确诊结果之间关联的p值通过Wilcoxon秩和检验进行估计。