Swyer 1954.

Methods	Double‐blind placebo controlled trial. 227 received DES and 233 had placebo.
Participants	All antenatal primigravida.
Interventions	Smith regimen.
Outcomes	Pre‐eclampsia, prematurity, labour duration and side effects of medication.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear

The studies used in computing the outcome data appear in brackets after the outcome. This is the most recent data for each trial with the greatest numbers. 
 DES: diethylstilboestrol 
 vs: versus