title: Statistical power to detect differences.
authors.forename: Kurt T
authors.initials: KT
authors.lastname: Barnhart
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology*; D016032:Randomized Controlled Trials as Topic; D016896:Treatment Outcome
chemical_list: D008727:Methotrexate