title: A pitfall in the use of the Altman nomogram for power estimation.
authors.forename: M J
authors.initials: MJ
authors.lastname: Evans
authors.forename: C A
authors.initials: CA
authors.lastname: Harrison
authors.forename: W W
authors.initials: WW
authors.lastname: Mapleson
mesh_terms: D018849:Controlled Clinical Trials as Topic / Q000379:methods*; D003627:Data Interpretation, Statistical; D006801:Humans; D010149:Postoperative Pain / Q000517:prevention & control; D010894:Piroxicam / Q000627:therapeutic use; D012107:Research Design
chemical_list: D010894:Piroxicam