| fertility | Total fertility rate means the number of children that would be born on average by the woman during the whole her reproductive age (15-49), by assumption, that in particular phases of this period she would give birth the children with the intensity observed in a given year, i.e. the age-specific fertility rates are treated as constant. |
| gross reproduction | The gross reproduction rate shows the number of daughters born on average by the woman assuming that she in her reproductive age (15-49) will bear with the intensity characteristic for all women bearing in the year for which the reproduction rate (constant fertility rates) is calculated. |