HospitalizationLength of StayRetrospective StudiesUnited StatesRisk FactorsPatient DischargePatient ReadmissionHeart FailureCohort StudiesTreatment OutcomeProspective StudiesIncidenceHospital CostsInfant, NewbornHealth Care CostsFollow-Up StudiesPatient AdmissionChild, HospitalizedAmbulatory CareTime FactorsPneumoniaInpatientsComorbidityAge DistributionHospital MortalityAge FactorsInfluenza, HumanSeverity of Illness IndexHospital ChargesEmergency Service, HospitalMedicareSeasonsRisk AssessmentHospitals, PsychiatricCost of IllnessGastroenteritisLogistic ModelsRotavirus InfectionsProportional Hazards ModelsDatabases, FactualInsurance, HospitalizationDenmarkAcute DiseaseMultivariate AnalysisPoisson DistributionCosts and Cost AnalysisRespiratory Syncytial Virus InfectionsSex DistributionRotavirus VaccinesBronchiolitisCost-Benefit AnalysisRegistriesPrognosisPopulation SurveillanceInternational Classification of DiseasesChronic DiseaseNew YorkSex FactorsBrazilCaliforniaAsthmaMorbidityUtilization ReviewOutcome Assessment (Health Care)Pulmonary Disease, Chronic ObstructivePrevalenceIsraelMyocardial InfarctionWounds and InjuriesHealth Services MisuseRegression AnalysisHealth ServicesOdds RatioCommunity-Acquired InfectionsRiskNursing HomesInsurance Claim ReviewCost SavingsSurvival AnalysisRespiratory Tract InfectionsKaplan-Meier EstimateSocioeconomic FactorsSpainConfidence IntervalsPredictive Value of TestsRenal DialysisCanadaTennesseeHealth ResourcesChi-Square DistributionSurvival RateHospitals, PublicInfluenza A Virus, H1N1 SubtypeSkilled Nursing FacilitiesHospitals, PediatricHospitalsInfectionAnti-Bacterial AgentsHealth Services ResearchMedicaid