National Longitudinal Study of Adolescent HealthLongitudinal StudiesAdolescent BehaviorUnited StatesAdolescent Health ServicesAdolescent PsychologyHealth SurveysSocioeconomic FactorsHealth StatusAdolescent MedicinePrevalenceSex FactorsLogistic ModelsPeer GroupFriendsCross-Sectional StudiesRisk-TakingAge FactorsFamily CharacteristicsHealth BehaviorRisk FactorsObesityEducational StatusParent-Child RelationsHealth Care SurveysSexual BehaviorCrime VictimsSchoolsBody Mass IndexCoitusQuestionnairesInterpersonal RelationsNutrition SurveysAlcohol DrinkingViolenceMultivariate AnalysisDepressionSubstance-Related DisordersJuvenile DelinquencyAdolescent DevelopmentMental HealthPublic HealthOdds RatioSelf ConceptSiblingsHealth PromotionSexual PartnersEuropean Continental Ancestry GroupSmokingSexually Transmitted DiseasesAfrican AmericansData CollectionDelivery of Health CareResidence CharacteristicsAttitude to HealthPopulation SurveillanceHispanic AmericansRegression AnalysisHealth PolicySocial SupportMental DisordersHealth Services AccessibilityInfant, NewbornHealth Knowledge, Attitudes, PracticeGermanyHealth EducationHealth Services Needs and DemandHealth Status DisparitiesIndiaHealth Care ReformAge DistributionPregnancy in AdolescenceSex DistributionNational Health ProgramsHealthComorbiditySocial EnvironmentParentsDietPrimary Health CareNational Institutes of Health (U.S.)School Health ServicesHealth PlanningChild WelfareQuality of Health CareParentingProspective StudiesInterviews as TopicHealth ServicesInsurance, HealthSocial ClassReproductive Health ServicesWorld HealthHealth Services ResearchHealth PersonnelCohort StudiesPregnancySexualityHealth ExpendituresEthnic Groups