title: Letter: Misuse of the chi-squared test.
mesh_terms: D003863:Depression / Q000188:drug therapy; D005260:Female; D006801:Humans; D010919:Placebos; D011736:Pyridoxine / Q000008:administration & dosage / Q000627:therapeutic use; D013223:Statistics as Topic; D026681:Vitamin B 6 Deficiency / Q000175:diagnosis
chemical_list: D010919:Placebos; D011736:Pyridoxine