It's all a matter of statistics.
D001565:Benzoates / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D003109:Colonic Diseases, Functional / Q000188:drug therapy*; D006801:Humans; D010627:Phenethylamines / Q000627:therapeutic use*; D010919:Placebos; D013223:Statistics as Topic
D001565:Benzoates; D010627:Phenethylamines; D010919:Placebos