Figure 3B illustrates the process of selecting the optimal λ value through 10-fold cross-validation. The optimal λ value was chosen when the error reached λmin + 1 standard error. Five predictor variables were identified: age (β = 0.792), treatment category (β = 0.156), cavities on CXR (β = 0.499), hypoalbuminemia (β = 0.317), and CRP level (β = 0.362). This evidence concerns the gene CRP and Hypoalbuminemia.