the intelligence quotient of school aged children delivered by cesarean section and vaginal delivery

background : there has always been an asking question with physicians and health staff whether delivery mode can effect on child intelligence. this study was conducted to compare the intelligence quotient (iq) of school aged children delivered by cesarean section and vaginal delivery in mashhad, iran. methods : this study conducted in two stages; a cross-sectional section in which 5000 randomly selected children, who were 6-7 years old, attended at 10 cognitive examination posts in mashhad. the examination was performed by the exceptional education and training institute affiliated to ministry of education for all 6-7 years old children at the entry to the primary school. at the second stage, we selected two matched groups of 189 children who delivered by cesarean section or spontaneous vaginal delivery and then compared their iq scores. results : the cesarean delivery group had significantly higher iq test scores. maternal and paternal educational levels were related to children's iq scores. after adjusting of maternal and paternal education, maternal age and parity, there was not any significant difference between iq scores of cesarean delivery and natural vaginal delivery groups 101(3.67) vs. 100.7(4.28). conclusions : based on our findings, the association between cesarean deliveries with better cognitive development in children cannot be supported. key words : intelligence quotient, school aged children, cesarean and vaginal delivery.