From recent epidemiological studies to emerging epidemiological evidence, it becomes evident that numerous primary studies have investigated the prevalence of ADHD in children and adolescents. Additionally, several systematic reviews and meta-analyses have explored this subject. The objective of this umbrella review is to offer a robust synthesis of evidence derived from these systematic reviews and meta-analyses

To conduct a comprehensive umbrella review that synthesizes emerging epidemiological evidence regarding the prevalence of ADHD in children and adolescents, drawing insights from numerous primary studies as well as systematic reviews and meta-analyses.

We conducted a systematic search across multiple databases, including PubMed, Web of Science, PsychINFO, and Scopus, to identify relevant studies. The study was preregistered with PROSPERO (registration number: CRD42023389704). To assess the quality of these studies, we utilized the Measurement Tool to Assess Systematic Reviews (AMSTAR). We employed an inverse variance-weighted random-effects meta-analysis to combine prevalence estimates from the included studies.

The final analysis incorporated thirteen meta-analytic systematic reviews, encompassing 588 primary studies and a total of 3,277,590 participants. A random-effects meta-analysis of these studies revealed that the global prevalence of ADHD in children and adolescents stood at 8.0% (95% CI: 6.0%–10%). Notably, the prevalence estimate was twice as high in boys (10%) compared to girls (5%). Among the three subtypes of ADHD, the inattentive type (ADHD-I) emerged as the most prevalent, followed by the hyperactive type (ADHD-HI) and the combined type (ADHD-C).

The comprehensive umbrella review findings emphasize the high prevalence of ADHD in children and adolescents, with a notable gender disparity, wherein boys are twice as likely to be affected compared to girls. These results underscore the urgency of prioritizing prevention, early identification, and treatment strategies for ADHD in children and adolescents.

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Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder commonly diagnosed in school-age children. However, it can affect individuals of all age groups. This study aimed to provide a comprehensive analysis of the prevalence of ADHD in adults by conducting an umbrella review of systematic reviews and meta-analyses.

To provide a comprehensive synthesis of published evidence on the prevalence of Attention Deficit Hyperactivity Disorder (ADHD) in adults through an umbrella review of systematic reviews and meta-analyses, with the aim of highlighting the significance of addressing and managing ADHD in the adult population.

To conduct this study, we adhered to the guidelines outlined in the Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA). We systematically searched databases such as PsychINFO, Web of Science, PubMed, and Scopus to identify relevant studies. Our review protocol was registered with PROSPERO (registration number: CRD42023389704). The quality of the studies included in our analysis was assessed using the A Measurement Tool to Assess Systematic Reviews (AMSTAR). For the purpose of conducting a meta-analysis, we employed a random-effects model.

Our umbrella review examined findings from five systematic reviews that encompassed data from 57 unique international primary studies undertaken between 2009 and 2021. These studies involved a total of 21,142,129 adult participants. The meta-analysis, employing an inverse variance-weighted random effect model, yielded a pooled prevalence estimate for ADHD in adults of 3.10% (95% confidence interval: 2.60%–3.60%). Regarding ADHD subtypes, our analysis revealed that ADHD-I (inattentive type) remained the most prevalent among adults, followed by ADHD-HI (hyperactive type) and ADHD-C (combined type).

Our results underscore the relatively high prevalence of ADHD among adults, with ADHD-I emerging as the most common subtype. These findings emphasize the need for proactive measures to prevent, mitigate, identify, and effectively manage ADHD in the adult population.

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