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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 and diagnostic ability of TREC and KREC combination in “Combined PID” and “Syndromic PID” diagnosis. Healthy individuals (n = 172); children diagnosed with “Combined PID” and “Syndromic PID” (n = 60). AUC for TREC and a combination of TREC and KREC = 0.82 (95% CI = 0.75–0.90).
