We compared 87 patients who delivered preterm from Group 1 (1) and 14 control patients from Group 3 (0). Statistical results are presented as the p-value, t, and df of performed tests in the diagram. We performed an additional analysis of PTB risk factors, including the previous history of PTB, previous history of miscarriages, parity, urinary tract infections, vaginitis, other infections, leucocythemia, fetal growth restrictions and poor socioeconomic status. Nonetheless, multivariate analysis showed no significant results.