Moore 2004.

Methods	Single centre randomised trial. Randomisation method: list of tables used, sealed envelopes. Blinding of intervention: not stated. Blinding of outcome assessment: no. Dropouts: none.
Participants	63 women. Inclusion criteria: impaired glucose tolerance (based on 100 g oral OGTT). Exclusions: insulin‐dependent diabetes mellitus, liver/kidney disease, chronic hypertension or seizure disorders, less than 11 weeks or more than 36 weeks' gestation. Setting: not stated.
Interventions	Intervention group: insulin. Control group: metformin.
Outcomes	Gestational age at birth, mode of delivery, shoulder dystocia, PPH, birthweight, Apgar score at 5 minutes, NICU admission, hypoglycaemia, RDS, hyperbilirubinemia.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear

AN: antenatal 
 CTG: cardiotocography 
 GD: gestational diabetes 
 GDM: gestational diabetes mellitus 
 GTT: glucose tolerance test 
 h: hour 
 IOL: induction of labour 
 IV: intravenous 
 NICU: neonatal intensive care unit 
 OGTT: oral glucose tolerance test 
 PIH: pregnancy‐induced hypertension (defined as blood pressure of at least 140/90) 
 PPH: postpartum haemorrhage 
 RDS: respiratory distress syndrome 
 SCBU: special care baby unit