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National Longitudinal Study of Adolescent HealthLongitudinal StudiesAdolescent BehaviorAdolescent Health ServicesAdolescent PsychologyUnited StatesHealth StatusAdolescent MedicineHealth SurveysPeer GroupRisk-TakingFriendsSex FactorsHealth BehaviorAge FactorsSocioeconomic FactorsParent-Child RelationsSexual BehaviorQuestionnairesRisk FactorsCrime VictimsInterpersonal RelationsLogistic ModelsSchoolsAlcohol DrinkingCoitusAdolescent DevelopmentSubstance-Related DisordersPrevalenceViolenceDepressionJuvenile DelinquencySelf ConceptEducational StatusMental HealthObesitySmokingCross-Sectional StudiesSiblingsPublic HealthEuropean Continental Ancestry GroupSexual PartnersFamily CharacteristicsAfrican AmericansBody Mass IndexHealth PromotionSexually Transmitted DiseasesDelivery of Health CareResidence CharacteristicsAttitude to HealthRegression AnalysisHispanic AmericansMultivariate AnalysisSocial SupportAgingHealth PolicyHealth Knowledge, Attitudes, PracticeHealth Services AccessibilityOdds RatioSocial EnvironmentHealth EducationHealth Status DisparitiesHealth Services Needs and DemandEpithelial-Mesenchymal TransitionTime FactorsParentsHealth Care ReformPregnancy in AdolescenceHealthProspective StudiesCohort StudiesHealth Care SurveysPregnancyTransition to Adult CareNational Health ProgramsParentingFollow-Up StudiesSocial ClassPrimary Health CareNational Institutes of Health (U.S.)Interviews as TopicSchool Health ServicesChild WelfareHealth PlanningQuality of Health CarePhase TransitionInsurance, HealthReproductive Health ServicesHealth ServicesSexualityWorld HealthInfant, NewbornFamilyHealth PersonnelEthnic GroupsMarijuana SmokingChild AbusePatient Acceptance of Health CareHealth Services ResearchTransition Elements