This is specifically first your first birth .
Intervention is defined as any or all of the following: Stretch and sweep, gel to start labour, ARM (breaking of the waters) before birth, episiotomy, syntocin, forceps, ventouse, CS (emergency or elective), managed 3rd stage (injection of syntocin to birth the placenta) or any other medicalised procedure that is designed to encourage birth or assist in the birth of the baby. Intervention does not include any pain relief.
To be clear, there is no judgement or suggestion that in anyone's birth the intervention is not warranted. I have no training in this field so it would be incredibly impertinent of me to suggest otherwise. This is merely to gain numbers as my hunch is that they would be an alarming number of women who had some intervention in their first birth.