= Fertility = ...ts or children, are excluded from consideration. The term {{TextTerm|total fertility|7|601}} has on occasions been used to refer to live births and late foetal

...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. ...births {of. {{RefNumber|41|1|4}} for late foetal death rate or stillbirth rate.)}}

...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}}.