Other perinatal factors, including sex, single or multiple birth, maternal age, mode of delivery, chorioamnionitis, PPROM, preeclampsia, and reproductive tract infections, did not show significant associations with the proportions of Vδ2+ T cells or other T cell subsets (γδT cells, αβT cells, CD4+CD8− CD8+CD4− and CD4−CD8−) in peripheral blood (Table 1). Here, CD4 is linked to preterm premature rupture of the membranes.