Key points are not available for this paper at this time.
The Swedish Multi-generation Register consists of data of more than nine million individuals, with information available on mothers in 97% and on fathers in 95% of index persons. Index persons are confined to those born from 1932 onwards and those alive on January 1, 1961. This register is a unique resource but is still underutilized.
Anders Ekbom (Thu,) studied this question.