Study	Reason for exclusion
Charles 1986	Non‐randomised trial, focuses on drug pharmacokinetics
Cormier 1988	Antibiotics were administered immediately prior to a procedure (this included curettage, manual removal of the placenta or manual examination of the uterus)
Costa 1998	The trial randomised a group of women with medium risk of infection; includes assisted vaginal delivery, vaginal, cervical or rectal tears
Kampikaho 1993	Antibiotics were started during labour
Matthias 1986	A randomised control trial in which the comparison group received skin/vulval cleansing. All women in both control and antibiotics groups had operative deliveries including episiotomies
Oluwalana 2017	Antibiotics administered during labour
Sharma 2014	Antibiotics were administered immediately prior to initiation of epidural labour analgesia
Yamagishi 2009	We could not extract separate data for those with uncomplicated vaginal births. Women who had third‐degree perineal lacerations were included among those who received prophylactic antibiotics