Final answer:
When considering the relative chance of a trial by vaginal delivery for a breech presentation, factors such as the type of breech presentation, pelvic contracture, uncontrolled diabetes, and multiparity should be considered.
Step-by-step explanation:
When considering the relative chance of a trial by vaginal delivery for a breech presentation, there are several factors to consider. One of these factors is the type of breech presentation, whether it is a frank or complete breech. Another factor is the presence of pelvic contracture, which can make vaginal delivery more difficult. Additionally, uncontrolled diabetes can also impact the decision to pursue vaginal delivery for a breech presentation. Lastly, multiparity, or having multiple previous pregnancies, may increase the likelihood of a successful vaginal delivery for a breech presentation.