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Receiver operating characteristic (ROC) curves for each of lymphocyte subpopulations (CD3, CD4, CD8, and CD19) individually; combined diagnostic ability of all lymphocyte subpopulations; IgA and IgG combined; TREC and KREC combined and diagnostic ability of TREC, KREC, IgA, and IgG combination in “Antibody PID” diagnosis. Healthy individuals (n = 144); children diagnosed with “Antibody PID” (n = 120). IgA, IgG, TREC, and KREC AUC = 0.77 (95% CI = 0.71–0.82).
