A case-control study is conducted to assess the relationship between heavy alcohol use during the first trimester of pregnancy and preterm delivery.A sample of 71 women who suffered preterm delivery are enrolled along with 50 who delivered full term.Each participants use of alcohol during pregnancy is ascertained.Heavy drinking is defined as 4 or more drinks on one occasion.Compute the odds ratio for preterm delivery as a function of heavy alcohol use.(The data are shown below.)

	Preterm Delivery	Full-Term Delivery
Heavy Alcohol Use	46	12
No Heavey Alcohol Use	25	38