Thema
Comparative Study
Journal Article
1.240
Age Factors
1.233
Population Characteristics
1.080
Population
1.074
Demographic Factors
1.063
Research Methodology
889
Studies
734
Comparative Studies
659
Population Dynamics
612
Developed Countries
607
Developing Countries
551
Youth
440
Family Planning
433
Biology
395
Diseases
391
Americas
372
Physiology
332
North America
324
Fertility
317
Research Report
311
Contraception
309
Economic Factors
308
Research Support, Non-U.S. Gov't
277
Health
271
Northern America
269
Behavior
257
Europe
257
Socioeconomic Factors
248
United States
246
Asia
238
Reproduction
224
Parity
207
Adolescents
206
Fertility Measurements
189
Mortality
189
Measurement
183
Socioeconomic Status
179
English Abstract
169
Family And Household
168
Ethnic Groups
155
Africa
152
Contraceptive Usage
147
Family Characteristics
144
Nuptiality
144
Sex Factors
140
Pregnancy
139
Psychological Factors
137
Delivery Of Health Care
135
Child
134
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