There was an overall trend of higher prevalence of ADHD, and other conditions, in half-siblings than full-siblings, in line with previous studies. 31 , 32 Individuals with ADHD had significantly increased risk of all physical conditions except rheumatoid arthritis, after adjusting for sex and birth year, compared with individuals without ADHD (p values <0·007; table 3 ).
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Mapping phenotypic and aetiological associations between ADHD and physical conditions in adulthood in Sweden: a genetically informed register study.
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