Assessment of culture and environment in the Adolescent Brain and Cognitive Development Study: Rationale, description of measures, and early data.

Although 64% of the tests of difference between the higher and lower risk groups are significant (80% of the Youth measures and 53% of the measures completed by parents), only four make the cut-off for a meaningful effect size, 0.20, which is typically the lowest level at which it makes sense to regard a difference as practically significant ( Cohen, 1988 ; McGraw and Wong, 1992 ).

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