Women having a baby privately are three times more likely to have a caesarean section than those who use public healthcare.
The research was published in the BMC Pregnancy and Childbirth journal.
It looked at over 70,000 women who gave birth at Coombe between 2009 and 2017.
In total, 75% of women used public health care, 11% used semi-private, while the remaining 14% used private services.
In terms of c-sections, 11% of public patients opted for the procedure while it was 29% for private patients.
"There's a large element of choice into how people's pregnancies are managed," said former Master at the Rotunda, Professor Sam Coulter Smith.
"Our job as obstetricians and midwives is to support people in the choices that they make. It's not to impose a particular philosophy on them, but to assist them and to counsel them in the choices that they make."
While for women included in the survey who had a second child, 90 percent decided to go with the same form of birth.