López-Escobar G, Riaño-Gamboa G, Fortney J, Janowitz B
Int J Gynaecol Obstet. 1979 Nov-Dec;17(3):284-9. doi: 10.1002/j.1879-3479.1979.tb00169.x.
All the breech presentations that occurred in a large sample of data on obstetric deliveries from a random sample of urban hospitals in Colombia are examined. The 463 breeches are analyzed by age and parity of the mother, type of breech presentation (frank or footling) and type of delivery (vaginal or abdominal). The data suggest that abdominal delivery reduces perinatal mortality although cell values are too small to adequately control for birth weight.