Salim, AgusWelsh, Alan2015-12-100002-9262http://hdl.handle.net/1885/55328A population survey for estimating prevalence is challenging when a disease or condition is difficult to diagnose. If clinical diagnosis is expensive, a 2-phase study, in which less expensive but less accurate tests are administered to all study subjectsdata acquisitiondisease prevalencedisease severitydisease spreadhealth surveymental healthagedagingAlzheimer diseasearticleAustraliaclinical researchclinical studycohort analysisgold standardhumanmajor clinical studymass EfficiencyMass screeningPatient selectionPsychiatrySampling studiesDesigning 2-Phase Prevalence Studies in the Absence of a Gold Standard Test200910.1093/aje/kwp1222016-02-24