Table 2.
Generational structure of people in the Umeå Demographic Database. Number of people (and proportion of the total cohort) are shown by generational depth
| Approximate birth year of known ancestor | Generational depth (N generations) | Individuals (N) | Proportion of total cohort (%) |
|---|---|---|---|
| 1875-1900 | 2 | 15,290 | 15.0 |
| 1850-1875 | 3 | 10,699 | 10.5 |
| 1825-1850 | 4 | 7,526 | 7.4 |
| 1800-1825 | 5 | 9,020 | 8.8 |
| 1780-1800 | 6 | 7,922 | 7.8 |
| 1760-1780 | 7 | 7,970 | 7.8 |
| 1740-1760 | 8 | 11,204 | 11.0 |
| 1720-1740 | 9 | 16,474 | 16.1 |
| 1700-1720 | 10 | 14,531 | 14.2 |
| 1680-1700 | 11 | 1,540 | 1.5 |
| 1660-1680 | 12 | 1 | 0 |
The generational depths shown above assume on average two generations for the population since 1950 and that all lineages from 1950 are represented in the extant population. The exact number of generations and size of the extant population will be known when the database is complete.