The global prevalence rate, for ADHD, varies considerably from a 7% rate in Japan to a 20% prevalence rate in Ukraine. What factors contribute to this variance?
A. The variance is explained by the level of economic development of the country.
B. The variance is explained by the number of students enrolled in schools in the country.
C. The variance is explained by the number of special educators in the country.
D. The variance is explained by differences in the definition and in procedures for collecting data.
Answer: D
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