Figure 2From: Prevalence of attention deficit hyperactivity disorder among children and adolescents in Spain: a systematic review and meta-analysis of epidemiological studies Prevalence of ADHD among children and adolescents in Spain: meta-analysis. Note: Random effects model. Cochran’s Q: χ2 = 367.8 (d.f. = 15), p < 0.001; I 2= 95.9%.Back to article page