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Confirming previous findings, variability in ADHD prevalence estimates is mostly explained by methodological characteristics of the studies. In the past three decades, there has been no evidence to suggest an increase in the number of children in the community who meet criteria for ADHD when standardized diagnostic procedures are followed.
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Guilherme V. Polanczyk
Erik G. Willcutt
Giovanni Abrahão Salum
International Journal of Epidemiology
Universidade de São Paulo
Universidade Federal do Rio Grande do Sul
Hospital de Clínicas de Porto Alegre
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Polanczyk et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69ded962499d77a496b0d063 — DOI: https://doi.org/10.1093/ije/dyt261