National Longitudinal Study of Adolescent HealthLongitudinal StudiesAdolescent BehaviorAdolescent Health ServicesAdolescent PsychologyUnited StatesHealth StatusPeer GroupHealth SurveysRisk-TakingHealth BehaviorAdolescent MedicineFriendsSex FactorsSexual BehaviorAge FactorsSocioeconomic FactorsAdolescent DevelopmentRisk FactorsParent-Child RelationsAlcohol DrinkingSubstance-Related DisordersCrime VictimsInterpersonal RelationsQuestionnairesJuvenile DelinquencySchoolsViolenceLogistic ModelsDepressionSelf ConceptCoitusPrevalenceEducational StatusObesitySmokingSiblingsMental HealthBody Mass IndexCross-Sectional StudiesAfrican AmericansEuropean Continental Ancestry GroupPublic HealthSexual PartnersSocial EnvironmentHealth PromotionResidence CharacteristicsFamily CharacteristicsSexually Transmitted DiseasesHispanic AmericansRegression AnalysisBehavior, AnimalAttitude to HealthMultivariate AnalysisSocial SupportDelivery of Health CareCohort StudiesAgingHealth Knowledge, Attitudes, PracticeOdds RatioParentsSocial BehaviorProspective StudiesParentingHealth PolicyFeeding BehaviorHealth EducationHealth Services AccessibilityFollow-Up StudiesHealth Status DisparitiesPregnancyMarijuana SmokingCourtshipHealth Services Needs and DemandSocial ClassTime FactorsPregnancy in AdolescenceInterviews as TopicHealth Care ReformHealthHealth Care SurveysNational Health ProgramsSuicide, AttemptedChild AbuseFamilyInfant, NewbornPersonality DevelopmentMental DisordersSchool Health ServicesPrimary Health CareAlcoholismNational Institutes of Health (U.S.)Child WelfareSelf ReportHealth PlanningChild Behavior DisordersAggressionQuality of Health CareData CollectionMotor Activity