title: Studies show BBT method fails to pinpoint ovulation for one-fifth of U. S. and one-fourth of British women.
mesh_terms: D000328:Adult; D001831:Body Temperature; D004967:Estrogens / Q000097:blood; D005260:Female; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D010061:Ovulation Detection / Q000379:methods*; D011374:Progesterone / Q000097:blood; D006113:United Kingdom; D014481:United States
chemical_list: D004967:Estrogens; D011374:Progesterone; D007986:Luteinizing Hormone