Can a vegetarian or low-salt diet reduce blood pressure? men with high blood pressure are assigned at random to one of four diets:
(1) normal diet with unrestricted salt;
(2) vegetarian with unrestricted salt;
(3) normal with restricted salt;
(4) vegetarian with restricted salt.
this experiment has one factor, the type of diet. two factors, high blood pressure and type of diet two factors, normal/vegetarian diet and unrestricted/ restricted salt. four factors, the four diets being compared. three factors, men, high blood pressure, and type of diet.