Figure 2.

ROC based on the Out-Of-Bag data from imbalanced RandomForest, trained on 1130 controls (probands who were not infected with COVID-19) and 55 COVID-19 cases detected by RT-PCR, with the asymptomatic cases excluded, where frequency of inflammation of upper respiratory tract, weight, height, age, gender, being a cold-water swimmer, being a sportsman, and frequency of cold/ice water swimming were used as the predictors. Abbreviations: AUC, area under the curve; FPR, false positive rate; TPR, true positive rate.