A couple of other studies:
A study of 1,240 singleton breech infants delivered at northern California Kaiser Permanente Medical Care Program hospitals between 1976 and 1977 has indicated that routine cesarean delivery of all breech fetuses is not necessary to prevent adverse morbid events in the breech infant or child. In order to qualify for the study, the infants had to have weighed at least 1,000 grams. Neurologic sequelae were considered up to four years of age. The study concluded that vaginally born breech infants were not at increased risk for asphyxia, head trauma, cerebral palsy or developmental delay. -Obstetrics and Gynecology, May 1990.
A Swedish study of 6,542 singleton fetuses born in the breech presentation was made to compare intrapartum related infant mortality in term breech presentations in terms of vaginal delivery or delivery by cesarean section. The main outcome measures were intrapartum and early neonatal deaths, stillbirths and congenital malformations, low Apgar scores, and mode of delivery. The intrapartum and early neonatal mortality rate was two per 2,248 (0.09 percent) in the group delivered vaginally and two per 4,029 (0.05 percent) in the group delivered by cesarean section. The relative risk was 1.81, thus the difference was not statistically significant. Authors of the study concluded that the intrapartum related mortality in the group delivered vaginally was low and the result could not verify an increased mortality in term breech presentations delivered vaginally compared with those delivered by cesarean section. -MIDIRS, March 1998