20. : data from a case-control study of
esophagaeal cancer in Ile-et-Vilaine, France
R esoph
agegp(Age group, 6 ), alcgp(Alcohol consumption, 4 ),
tobgp(Tobacco consumption, 4 ), ncases (number of
cases), ncontrols(number of controls) 5
agegp, alcgp, tobgp case control