title: Lost sampling units and investigational power.
authors.affiliation: Creighton University, Omaha, NE 68178.
authors.forename: R P
authors.initials: RP
authors.lastname: Heaney
mesh_terms: D003627:Data Interpretation, Statistical; D006801:Humans; D010024:Osteoporosis / Q000188:drug therapy; D016032:Randomized Controlled Trials as Topic