Thema
Age Factors
11.942
Journal Article
11.773
Population
10.703
Demographic Factors
10.606
Population Characteristics
10.601
Research Methodology
5.918
Developing Countries
5.588
Population Dynamics
5.368
Youth
5.117
Developed Countries
4.885
Family Planning
3.923
Diseases
3.826
Studies
3.289
Economic Factors
3.262
Americas
3.250
Biology
3.027
Behavior
3.006
North America
2.858
Fertility
2.763
Health
2.649
Contraception
2.627
Adolescents
2.623
Asia
2.533
Socioeconomic Factors
2.480
Northern America
2.373
Physiology
2.349
Research Report
2.282
United States
2.274
Europe
1.827
Research Support, Non-U.S. Gov't
1.734
Socioeconomic Status
1.719
Mortality
1.702
Reproduction
1.696
Family And Household
1.674
Africa
1.601
English Abstract
1.592
Child
1.584
Education
1.559
Fertility Measurements
1.456
Delivery Of Health Care
1.444
Measurement
1.434
Psychological Factors
1.416
Family Characteristics
1.406
Parity
1.372
Africa South Of The Sahara
1.321
Reproductive Behavior
1.302
Organization And Administration
1.293
Comparative Study
1.248
Sex Factors
1.243
Adolescents, Female
1.212
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