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Age at menarche, at first intercourse, and at first pregnancy

J R Udry

    Journal of Biosocial Science
    |October 1, 1979
    PubMed
    Summary

    No abstract available in PubMed .

    Keywords:
    Adolescent PregnancyAdolescentsAge FactorsAge ReportingAge Specific Fertility RateAmericasBlacksCoitusContraceptionCorrelation StudiesCultural BackgroundDemographic FactorsDeveloped CountriesEthnic GroupsFamily PlanningFecundityFertilityMaternal AgeMenarcheMenstrual CycleMenstruationNorth AmericaNorthern AmericaParental AgePopulationPopulation CharacteristicsPopulation DynamicsPregnancyReproductionReproductive BehaviorResearch MethodologyResearch ReportStatistical StudiesStudiesUnited StatesUrban PopulationWhitesWomenYouth

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