title: Method, design, and analysis of a comparative study of analgetics.
mesh_terms: D000082:Acetaminophen / Q000627:therapeutic use*; D000700:Analgesics / Q000627:therapeutic use*; D000704:Analysis of Variance; D002110:Caffeine / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D006801:Humans; D010146:Pain / Q000188:drug therapy; D010919:Placebos; D011930:Reaction Time / Q000187:drug effects; D013881:Thioridazine / Q000627:therapeutic use*
chemical_list: D000700:Analgesics; D010919:Placebos; D000082:Acetaminophen; D002110:Caffeine; D013881:Thioridazine