France 1988a.

Methods	Allocation concealment: not stated. Authors state "random order". 3‐arm study, the two beta blocker arms were combined for the analysis.
Participants	63 women at 7‐36 weeks' gestation with DBP > 90 mmHg x 2, 8 days apart).
Interventions	Exp: (1) oral acebutolol 400 mg to 1200 mg (21 women); (2) oral labetalol 400 mg to 1200 mg (21 women). Control: oral methyldopa 500 mg to 1500 mg (21 women).
Outcomes	Women: PE, caesarean section. Babies: perinatal death, preterm delivery, birthweight (mean), Apgar, admission to SCBU, hypoglycaemia.
Notes	No mention about Korotkoff sound considered for DBP. Main paper in French. Funding: no information about funding source. Declaration of interests not described.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Apres tirage au sort, effectué par groupe de 9 patientes..."
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Open‐label trial.
Blinding of outcome assessment (detection bias) All outcomes	High risk	No.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No.
Selective reporting (reporting bias)	Unclear risk	Assessment from published study report.
Other bias	Unclear risk	Groups appear comparable at baseline. No information about funding source. Declaration of interests not described.