Studies Journal Article 255 Research Methodology 249 Developing Countries 204 Population 201 Demographic Factors 193 Population Dynamics 156 mehr ... Asia 132 Economic Factors 118 Population Characteristics 108 Sampling Studies 98 Surveys 94 Family Planning 85 Fertility 79 Socioeconomic Factors 79 Comparative Studies 78 Comparative Study 78 Southern Asia 77 Americas 72 Age Factors 61 Contraception 59 Developed Countries 59 Socioeconomic Status 57 Latin America 55 Behavior 54 Fertility Measurements 47 North America 47 Family And Household 46 Nuptiality 43 English Abstract 41 weniger ...