Cohort StudiesProspective StudiesRisk FactorsRetrospective StudiesFollow-Up StudiesIncidenceProportional Hazards ModelsLongitudinal StudiesDenmarkRisk AssessmentTime FactorsPregnancyInfant, NewbornTreatment OutcomeQuestionnairesAge FactorsRiskMultivariate AnalysisLogistic ModelsPrevalenceEpidemiologic MethodsUnited StatesOdds RatioNetherlandsSwedenSex FactorsGreat BritainPrognosisCase-Control StudiesSmokingConfidence IntervalsBody Mass IndexRegistriesJapanCause of DeathCohort EffectPredictive Value of TestsSeverity of Illness IndexSocioeconomic FactorsHIV InfectionsRegression AnalysisComorbidityCardiovascular DiseasesHospitalizationNeoplasmsSurvival AnalysisBirth WeightAge DistributionMortalitySex DistributionOccupational DiseasesKaplan-Meier Estimate