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Table S1. Total sample sizes of the studied sample*, by country.

Table S2. Comparison of the study sample with Part 2 sample

Table S3. Association between hoarding, obsessive-compulsive symptoms and ADHD symptoms1

Table S4. Prevalence of ADHD symptoms in individuals with and without hoarding by sex

Table S5. Logistic regression for hoarding and obsessive-compulsive (OC) symptoms controlling additionally for hoarding/other OC symptoms*

Table S6. Prevalence of hoarding symptoms by age group

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