Abstract:Despite the importance and prevalence of intellectual disability (ID), its origins have not been well understood until now. Lichtenstein et al. report in this issue findings from a population‐based sample four times larger than all previous family studies of ID put together (Lichtenstein et al., 2022). From more than four million people, 37,787 individuals were identified with ID. Relative risks (RRs) are reported for relatives of ID probands (55,000 first‐degree, 55,000 second‐degree, and 170,000 third‐degree… Show more
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