Italy 2000.

Methods	Allocation concealment: consecutive‐numbered treatment boxes.Two arms
Participants	20 women with PE (no further details).
Interventions	Exp: oral nifedipine GITS 30 mg/day to 60 mg/day. (10 women) Control: oral methyldopa 500 mg/day to 1000 mg/day. (10 women)
Outcomes	Women: BP, PE, Doppler abnormalities, need for drug adjustment, severe HT. Babies: fetal and neonatal death, preterm birth, SGA (undefined), Apgar score.
Notes	Published as an abstract only. Method for measuring BP not stated. Additional data provided by authors. 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	Not described.
Allocation concealment (selection bias)	Low risk	Consecutive numbered treatment boxes provided by pharmacy (personal communication).
Blinding of participants and personnel (performance bias) All outcomes	High risk	Single‐blind (only for participants).
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)	Low risk	Additional data provided by authors.
Other bias	Unclear risk	No information about funding source. Declaration of interests not described.