IL6 and puerperal infection: No statistically significant differences were observed between the two groups in terms of the rates of soft birth canal injury, episiotomy, neonatal asphyxia, postpartum urinary retention, postpartum puerperal infection, umbilical cord prolapse, etc. In particular, no significant difference was found in two sensitive indices: the levels of serum CRP and IL-6, which represent the degree of inflammatory stress responses (11).