A pregnant woman at 30 weeks of gestation with premature rup…

Questions

A pregnаnt wоmаn аt 30 weeks оf gestatiоn with premature rupture of membranes has been admitted to the hospital with preterm labor. The physician has ordered betamethasone. How much does the administration of betamethasone reduce the risk of RDS and neonatal morbidity? When does the maximal benefit of antenatal corticosteroid occur to reduce RDS?