FriendsSociometric TechniquesPeer GroupInterpersonal RelationsQuality of LifeSocializationRejection (Psychology)Social BehaviorNational Longitudinal Study of Adolescent HealthSocial AdjustmentShynessSocial SupportSocial IsolationSocial NetworkingAdolescent BehaviorJuvenile DelinquencySocial ParticipationAdolescent DevelopmentSocial FacilitationNegotiatingGender IdentitySocial IdentificationHelping BehaviorDominance-SubordinationSocial PerceptionLifeQuestionnairesSchoolsSocial EnvironmentAggressionObject AttachmentNeurobiologyRolePersonality AssessmentLongitudinal StudiesSelf ConceptEmpathyConflict (Psychology)Marijuana SmokingSex FactorsAdolescent PsychologyPersonality DevelopmentPlay and PlaythingsChild BehaviorSpinal DysraphismSocial DominanceAsperger SyndromeAdaptation, PsychologicalSelf DisclosureChild Development Disorders, PervasiveSuicidal IdeationInternal-External ControlSelf ReportModels, PsychologicalPennsylvaniaParentingInterview, PsychologicalAlcohol DrinkingPhobic DisordersLife Change EventsMexican AmericansChoice BehaviorDepressionRegression AnalysisStudentsAffectPsychometricsParent-Child RelationsParentsLife Cycle StagesContinental Population GroupsAnxietyLeisure ActivitiesAttention Deficit Disorder with HyperactivityFamilyModels, StatisticalCommunicationSocioeconomic FactorsAnalysis of VarianceUnited StatesCross-Sectional StudiesLife TablesModels, TheoreticalAge FactorsCaliforniaSmokingPsychiatric Status Rating ScalesTime FactorsCooperative BehaviorRisk FactorsLife Support CareInterviews as TopicChi-Square DistributionDepressive DisorderInternetData CollectionLogistic Models