Age Factors Journal Article 184 Demographic Factors 182 Population 182 Population Characteristics 180 Developing Countries 131 Youth 114 plus ... Population Dynamics 90 Asia 85 Adolescents 74 Economic Factors 72 Health 65 Americas 57 Developed Countries 50 Eastern Asia 49 Family Planning 48 Organization And Administration 47 Behavior 45 Education 45 Fertility 45 North America 44 Programs 43 Diseases 41 Research Methodology 41 Socioeconomic Factors 38 Latin America 36 China 35 Reproductive Health 33 English Abstract 31 Reproductive Behavior 29 moins ...