Reproducibility of ResultsSampling StudiesCross-Sectional StudiesEthiopiaPrevalenceQuestionnairesNigeriaVisually Impaired PersonsIranIndiaMalaysiaBlindnessHealth Knowledge, Attitudes, PracticeRural PopulationSample SizeChinaTrachomaUrban PopulationVision, LowRisk FactorsHealth SurveysAlgorithmsRural HealthCluster AnalysisAge DistributionPakistanTurkeySocioeconomic FactorsSex DistributionModels, StatisticalMonte Carlo MethodComputer SimulationLogistic ModelsInterviews as TopicRandom AllocationSex FactorsRepublic of KoreaSingaporeAge FactorsEducational StatusRefractive ErrorsFamily CharacteristicsData Interpretation, StatisticalData CollectionSpainStudentsUniversitiesPopulation SurveillanceProbabilityBrazilDental CariesInfant, NewbornJapanModels, TheoreticalChorionic Villi SamplingModels, GeneticOdds RatioResidence CharacteristicsPatient Acceptance of Health CareHealth Care SurveysTime FactorsSocial ClassMalariaAttitude to HealthEpidemiologic MethodsMass ScreeningPregnancyVisual AcuitySpecimen HandlingSmokingConfidence IntervalsEnvironmental MonitoringHealth EducationBlood Specimen CollectionDietCase-Control StudiesAsian Continental Ancestry GroupRegression AnalysisBody Mass IndexRetrospective StudiesMultivariate AnalysisHealth StatusHealth BehaviorLife StyleIncidencePrimary Health CareUnited StatesPetrosal Sinus SamplingObesityAir MicrobiologyHypertensionLot Quality Assurance SamplingAir Pollutants, OccupationalPopulation DensityPhylogenyBayes TheoremSensitivity and SpecificityEntomologySeasonsSelection Bias