Menu
Start Screening

Frontier mental health research: psychedelics & drug studies

Each month our editorial team sifts through hundreds of papers and curates notable findings—for practitioners and informed readers who want to stay current with the evidence. Subscribe to the monthly Research Digest for expert analysis and concise summaries of key papers.

Cognitive Abilities and Testing American Journal of Psychiatry

1 paper

The Worldwide Prevalence of ADHD: A Systematic Review and Metaregression Analysis

Guilherme V. Polanczyk, Maurício Silva de Lima, Bernardo Lessa Horta, Joseph Biederman, Luís Augusto Rohde
American Journal of Psychiatry Summary & key facts 2007 5,230 citations

Our findings suggest that geographic location plays a limited role in the reasons for the large variability of ADHD/HD prevalence estimates worldwide. Instead, this variability seems to be explained primarily by the methodological characteristics of studies.

Attention Deficit Hyperactivity Disorder Cognitive Abilities and Testing
Summaries and links are for general information and education only. They are not a substitute for reading the original publication or for professional medical, legal, or other advice. Always refer to the linked source for the full study.