Kheiriyat 2016.

Study characteristics
Methods	Randomised controlled trial
Participants	Setting: Rahzi Hospital, Ahwaz, Iran. 2015 Inclusion criteria: multiparous women with a normal‐term vaginal delivery and postpartum pain Exclusion criteria: women who were unable to be sedated and other interventions required, dystocia, prolonged labour, history of caesarean section or other abdominal surgery, any history of postpartum haemorrhage; history of underlying disease
Interventions	Women had their pain assessed and were randomly divided into 1 of 2 study groups (below), they received their allocated study medication 6‐hourly up to 4 times if required Experimental intervention: dill essence (Anethum graveolens extract) 1.5 mg/kg body weight, up to 4 doses (N = 54) Control/comparison: 250 mg Mefenamic acid, up to 4 doses (N = 54)
Outcomes	Pain however measured by the authors: 2 hours after delivery, pain severity was measured by pain ruler. If pain score > 3.1, women were studied further. Subsequent measurements were made before and 30 minutes after each intervention 6‐hourly over 24 hours if pain continued
Notes	Funding: Ahvaz Jundishapur University of Medical Sciences No declaration of interests stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Women were randomly divided, no other detail provided
Allocation concealment (selection bias)	Unclear risk	Not stated
Blinding of participants and personnel (performance bias) All outcomes	High risk	Study not blinded
Blinding of outcome assessment (detection bias) All outcomes	High risk	Study not blinded
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Abstract only, total numbers randomised reported but not the number analysed. There were 54 women allocated to each group
Selective reporting (reporting bias)	Unclear risk	No published full text or protocol available. Trial registration available but study report is abstract only
Other bias	Unclear risk	Full article not available in English. Translation to be requested