Figure 2

Model development, internal and external validation workflow. AUC-ROC, area under the receiver operating characteristic curve; GLMNET, Lasso and Elastic-Net Regularised Generalised Linear Models; MLR, multivariable logistic regression; LUCAS, model using Lymphocyte, Urea, CRP, Age, Sex; CXR, Chest X-ray; NEWS2, National Early Warning Score; n, the number of predictors.