Spearman rank correlation coefficients for cell populations mandatory for PID screening and classification according to the ESID criteria (i.e. total lymphocytes, total B-cells, pre-GC B-cells, unswitched and switched MBC/PC, total T-cells, CD4+ and CD8+ T-cells, CD4+ and CD8+ naïve and central memory T-cells, TCRγδ+ and TCRγδ- CD4-CD8- T-cells, NK-cells) are shown in Table 3. This evidence concerns the gene CD4 and pelvic inflammatory disease.