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| Period | Net reproduction rate1 | Age at birth2 | Period | Net reproduction rate1 | Age at birth2 | Observed mean age at first marital birth4 | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average | Median3 | Average | Median3 | ||||||||||||||||||||||||||||||||||||
| 1846-1850 | 1.499 | 32.8 | 32.2 | 1926-1930 | 0.994 | 31.2 | 30.3 | .. | |||||||||||||||||||||||||||||||
| 1851-1855 | 1.617 | 32.8 | 32.2 | 1931-1935 | 0.836 | 30.7 | 29.8 | .. | |||||||||||||||||||||||||||||||
| 1856-1860 | 1.630 | 32.8 | 32.2 | 1936-1940 | 0.836 | 30.2 | 29.2 | 26.9 | |||||||||||||||||||||||||||||||
| 1861-1865 | 1.481 | 32.8 | 32.2 | 1941-1945 | 0.984 | 29.9 | 29.0 | 27.1 | |||||||||||||||||||||||||||||||
| 1866-1870 | 1.534 | 32.8 | 32.2 | 1946-1950 | 1.198 | 29.8 | 28.9 | 26.9 | |||||||||||||||||||||||||||||||
| 1871-1875 | 1.544 | 32.8 | 32.2 | 1951-1955 | 1.242 | 28.7 | 27.5 | 26.1 | |||||||||||||||||||||||||||||||
| 1876-1880 | 1.632 | 32.7 | 32.1 | 1956-1960 | 1.369 | 28.1 | 26.7 | 25.3 | |||||||||||||||||||||||||||||||
| 1881-1885 | 1.558 | 32.7 | 32.1 | 1961-1965 | 1.399 | 27.8 | 26.4 | 24.1 | |||||||||||||||||||||||||||||||
| 1886-1890 | 1.532 | 32.6 | 32.1 | 1966-1970 | 1.304 | 27.3 | 26.0 | 23.6 | |||||||||||||||||||||||||||||||
| 1891-1895 | 1.554 | 32.5 | 31.9 | 1971-1975 | 1.074 | 26.6 | 25.4 | 23.4 | |||||||||||||||||||||||||||||||
| 1896-1990 | 1.624 | 32.2 | 31.5 | 1976-1980 | 0.851 | 26.7 | 25.7 | 24.8 | |||||||||||||||||||||||||||||||
| 1901-1905 | 1.567 | 32.1 | 31.4 | 1981-1985 | 0.807 | 27.2 | 26.3 | 25.8 | |||||||||||||||||||||||||||||||
| 1906-1910 | 1.501 | 31.9 | 31.2 | 1986-1990 | 0.876 | 27.8 | 27.0 | 26.6 | |||||||||||||||||||||||||||||||
| 1911-1915 | 1.430 | 31.8 | 31.0 | 1991-1995 | 0.903 | 28.6 | 27.9 | 27.7 | |||||||||||||||||||||||||||||||
| 1916-1920 | 1.311 | 31.5 | 30.7 | 1996-2000 | 0.891 | 29.1 | 28.5 | 28.6 | |||||||||||||||||||||||||||||||
| 1921-1925 | 1.244 | 31.3 | 30.4 | 2001-2005 | 0.869 | 29.6 | 29.2 | 29.0 | |||||||||||||||||||||||||||||||
| 1 | Average number of live-born daughters born to a woman living through the child-bearing period, assuming that the existing fertility and mortality pattern will remain. |
| 2 | Age at birth (average/median) to be found for a cohort living through the age-specific fertility rates observed in the (reference) period. This 'hypothetical' age at birth is not being influenced by cohort size variations, as opposed to the 'observed' age at birth based on actual births in the period. In this case, however, the difference from 'observed' age is insignificant after 1940. |
| 3 | The age where one half of the women was younger or had exactly reached that age. |
| 4 | Average age of those having their first child in the period, thus being influenced by cohort variations. The difference between observed an hypothetical age at first birth is probably similar to that of age at first marriage, see table 3.26, never married. |
| Source: REP Cohort and Period Fertility in Norway 1820-1993. | |