Age Factors Journal Article 174 Demographic Factors 172 Population 172 Population Characteristics 170 Developing Countries 124 Youth 112 mehr ... Asia 80 Population Dynamics 80 Adolescents 72 Economic Factors 66 Health 65 Americas 55 Eastern Asia 46 Family Planning 46 Organization And Administration 46 Behavior 45 Developed Countries 45 Education 44 Fertility 42 North America 42 Programs 42 Diseases 41 Research Methodology 36 Latin America 35 Reproductive Health 33 Socioeconomic Factors 33 China 32 English Abstract 31 Taiwan 29 weniger ...