Is quality of life related to high autistic traits, high ADHD traits and their Interaction? Evidence from a Young-Adult Community-Based twin sample.

The sample was community-based but enriched for high traits and excluded individuals with an estimated IQ below 70, limiting generalizability to those with intellectual disabilities. The study used a cross-sectional design, so causal relationships between traits and quality of life cannot be determined. Data relied heavily on self-report for traits and quality of life, raising the possibility of response bias where individuals with higher traits may also report lower quality of life. The sample consisted of twins, who may have different social support structures compared to the general population, potentially influencing quality of life outcomes. Parental socioeconomic status was measured when participants were 18 months old, which may not reflect their current socioeconomic circumstances.

The study was funded by the UKRI Medical Research Council, the Economic and Social Research Council, the Foundation for the National Institutes of Health, and MQ: Transforming Mental Health. No specific conflicts of interest were declared by the authors in the provided text.

Do not assume that the co-occurrence of high autistic and high ADHD traits creates a uniquely worse quality of life profile than either trait alone. The study found no significant interaction, meaning the effects of each trait on quality of life were independent and additive rather than synergistic.