Trial name or title	Single versus multiple courses of antenatal betamethasone: evaluation of preterm infant’s outcome
Methods
Participants	Pregnant women with intact membranes and gestational age between 28 weeks and 35 weeks and 6 days who were high risk for preterm labour
Interventions	1. Intramuscular injection of 12 mg betamethasone repeated after 24 hours, followed by 2 courses of placebo every 10 days 2. Intramuscular injection of 12 mg betamethasone repeated after 24 hours, followed by 2 other treatment courses every 10 days
Outcomes
Starting date	22.09.2008
Contact information	Zataroud@mazums.ac.irz z.atarod64@yahoo.com
Notes	Irct registration number : IRCT138711261689N1