Familial factors inflate the estimated effects of genetic liability to ADHD on behavioural outcomes
How to prepare an accurate paper press kit? Illustrated guide
D. C. P. Crick, N. M. Davies, S. Medland, D. Evans · DOI: 10.64898/2026.10.27.26366008 · Summary page
Why cover this story this week?
ADHD risk is also a family question
Associations between ADHD and later difficulties are often read as evidence that ADHD itself causes those outcomes. A family-based genetic preprint challenges that interpretation. Researchers compared population estimates with within-sibling estimates of the effects of genetic liability to ADHD, examining 16 health and behavioural outcomes using analyses of up to 164,220 siblings. Associations with smoking, alcohol use, depressive symptoms and several educational and reproductive outcomes weakened in the family-based comparisons.
For example, the estimated effect on depressive symptoms fell from 0.059 SD to 0.002 SD. Comparing siblings helps separate individual genetic liability from familial influences that population studies can mix together. The findings suggest that some burden attributed to ADHD may instead reflect its family and environmental context. They do not establish that ADHD treatment is ineffective: the study estimates effects of genetic liability, not treatment effects. Its practical challenge is to consider whether support should address family circumstances alongside individual needs.
Editorial context written by AI from abstracts, not independent scientific validation. The kit and its verified quotes rely on the source paper, not on this letter.
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