Table 1 Details of data used in the present study, for each population separately and for all populations combined.
From: Mothers with higher twinning propensity had lower fertility in pre-industrial Europe
Population | Locations | Maternal birth period | Mothers | Non-twinners | Twinners | Twinner rate (‰) | Offspring birth period | Births | Singleton births | Twin births | Twinning rate (‰) | Total births (min-median-max) | References |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finland East | Jaakkima, Rautu | 1742–1899 | 871 | 781 | 90 | 103.33 | 1771-1940 | 4444 | 4347 | 97 | 21.83 | 1-7-17 | |
Finland Lapland | Inari, Enontekiö and Sodankylä | 1700–1884 | 757 | 695 | 62 | 81.9 | 1725-1918 | 3548 | 3482 | 66 | 18.6 | 1-6-13 | |
Finland SW-Archipelago | Hiittinen, Kustavi, Rymättylä | 1709–1899 | 2737 | 2443 | 294 | 107.42 | 1732-1942 | 12136 | 11816 | 320 | 26.37 | 1-6-15 | |
Finland West | Ikaalinen, Pulkkila, Tyrvää | 1700–1899 | 5669 | 5200 | 469 | 82.73 | 1721-1943 | 30733 | 30224 | 509 | 16.56 | 1-7-16 | |
Krummhörn | Lower Saxony, Germany | 1705–1823 | 3739 | 3461 | 278 | 74.35 | 1725-1868 | 17634 | 17336 | 298 | 16.9 | 1-6-17 | |
Sami Lapland | Inari, Enontekiö and Sodankylä | 1703–1880 | 957 | 885 | 72 | 75.24 | 1729-1920 | 4858 | 4780 | 78 | 16.06 | 1-7-13 | |
Sweden Lapland | Karesuando, Jukkasjärvi, Jokkmok, Vilhelmina and Jällivaara | 1721–1878 | 1943 | 1797 | 146 | 75.14 | 1749-1902 | 11106 | 10946 | 160 | 14.41 | 1-8-17 | |
Switzerland | Linthal, Elm | 1700–1899 | 4617 | 4394 | 223 | 48.3 | 1720-1945 | 21374 | 21138 | 236 | 11.04 | 1-6-18 | |
All the above | All the above | 1700–1899 | 21290 | 19656 | 1634 | 76.75 | 1720-1945 | 105833 | 104069 | 1764 | 16.67 | 1-7-18 | This paper |
