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ADHD in the United States: Increase in Recent Years
Evidence from multiple studies indicates a significant rise in parent-reported ADHD cases in the United States during the 2000s. One study revealed a 22% increase in prevalence among children aged 4-17 between 2003 and 2007, with rates climbing from 7.8% to 9.5%. Another investigation corroborated this trend, showing that for children aged 5-17, the prevalence increased from 6.9% in 1998–2000 to 9.0% in 2007–2009.
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Demographics with the Greatest Increase in ADHD Prevalence (2003-2007)
Methodological Limitations of Parent-Reported ADHD Prevalence Studies
Speculative Explanations for the Apparent Rise in ADHD Prevalence
A public health researcher reviews two studies on the prevalence of a common neurodevelopmental disorder among children in the United States. The findings are as follows:
- Study 1 (2003-2007): The percentage of children aged 4-17 reported by their parents as having the disorder increased from 7.8% to 9.5%.
- Study 2 (1998-2009): The percentage of children aged 5-17 reported by their parents as having the disorder increased from 6.9% to 9.0%.
Based only on the information provided in these two studies, what is the most logical conclusion the researcher can draw?