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Table 2 Descriptive statistics for ADHD scale raw scores.

From: Genetic influences on attention deficit hyperactivity disorder symptoms from age 2 to 3: A quantitative and molecular genetic investigation

 

CBCL ADHD scale

RRPSPC scale

ADHD Composite*

Mean (age 2)

4.28

2.10

1.21

SD (age 2)

2.57

1.89

0.37

Mean (age 3)

3.99

2.12

1.16

SD (age 3)

2.64

1.91

0.39

  1. N = 312; each mean and SD calculated through a random selection of one twin from each pair. *Scores residualised for sex effects and square-root transformed.
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BMC Psychiatry

ISSN: 1471-244X

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