...the {{TextTerm|computation|3|132}} of ratios, proportions, percentages, or rates (cf. paragraph 133). The last three are particular types of ratio. ...e.g. cause mortality rates (cf. {{RefNumber|42|1|7}}). On other occasions rates may be given per head or per person. The word "rate" is sometimes omitted,

...xEntry=cohort rate|OtherIndexEntry=rate, cohort}} or {{TextTerm|generation rates|5|153|2|IndexEntry=generation rate|OtherIndexEntry=rate, generation}}, whic

...en of childbearing age, i.e., 15 or 20 to 44 or 49, is used as an index of fertility when reliable birth statistics are not available. ...tes|8|631|2|IndexEntry=age-specific birth rate|OtherIndexEntry=birth rate, age-specific}}. Here again, births arc usually taken to mean live births.

The interaction of fertility and mortality leads to a consideration of {{TextTerm|population growth|1|70 ...Entry=potential, growth}} of a set of age-specific fertility and mortality rates. A stable population in which the rate of natural increase is zero is calle

...f these rates will refer to different periods of time. Where statistics of fertility by age are not available, the so-called {{TextTerm|replacement index|8|711| ...s lived within this group in the life table is known as the {{NoteTerm|net fertility schedule}}.