Hazardous SubstancesAnimal Testing AlternativesToxicity TestsToxicologyRisk AssessmentProportional Hazards ModelsRisk FactorsProspective StudiesFollow-Up StudiesReproducibility of ResultsTreatment OutcomeCohort StudiesTime FactorsPrognosisPredictive Value of TestsNursing AssessmentOutcome Assessment (Health Care)Retrospective StudiesKaplan-Meier EstimateQuestionnairesSurvival AnalysisSeverity of Illness IndexIncidenceUnited StatesSensitivity and SpecificityMultivariate AnalysisGeriatric AssessmentNeeds AssessmentNutrition AssessmentSurvival RateObserver VariationAge Factors