Dependency ratios
Foetal death ratio
Parity progression ratio
Mean age at child bearing
Own-children method
Wedlock status of the mother at the time of the child's birth
Population sex ratio
Sex ratio at birth
Compaction Ratio
Coverage ratio
Dilution Ratio
Precipitation-effectiveness Ratio
Ratio estimation
Quantity relative
Biogas
Infant deaths
Sampling fraction
Total fertility
Adoption
Price relative
Cost-benefit Analysis
Age
Birth history
Foreigners admitted for family formation or reunification
Illegitimate birth
Item response rate
Legitimate birth
Rate
Growth rate
Social security benefits in cash
Emission Factor
Dependants
Total fertility rate
Biodiversity Indices