Linear regression analyses of the number of COMT158Val and DAT1 10R alleles on the hyperactivity/inattention scores from the Strengths and Difficulties Questionnaire according to sex
| Sex | Age, yr | Group | n | SDQ score, mean ± SD | β coefficient | t | p value | R2 |
|---|---|---|---|---|---|---|---|---|
| Male | 11 | No COMT158Val or DAT1 10R | 36 | 4.39 ± 3.19 | 0.049 | 2.189 | 0.029 | 0.012 |
| COMT158Val or DAT1 10R | 438 | 4.52 ± 3.10 | ||||||
| COMT158Val and DAT1 10R | 1467 | 4.91 ± 3.08 | ||||||
| 15 | No COMT158Val or DAT1 10R | 37 | 3.05 ± 3.04 | 0.064 | 2.832 | 0.005 | 0.008 | |
| COMT158Val or DAT1 10R | 438 | 3.99 ± 3.06 | ||||||
| COMT158Val and DAT1 10R | 1469 | 4.35 ± 3.16 | ||||||
| Female | 11 | No COMT158Val or DAT1 10R | 22 | 3.77 ± 2.50 | −0.023 | −1.060 | 0.29 | 0.003 |
| COMT158Val or DAT1 10R | 482 | 3.97 ± 3.02 | ||||||
| COMT158Val and DAT1 10R | 1532 | 3.79 ± 3.03 | ||||||
| 15 | No COMT158Val or DAT1 10R | 22 | 2.82 ± 2.08 | 0.012 | 0.522 | 0.60 | 0.003 | |
| COMT158Val or DAT1 10R | 481 | 3.38 ± 2.82 | ||||||
| COMT158Val and DAT1 10R | 1534 | 3.41 ± 2.95 |
SD = standard deviation; SDQ = Strengths and Difficulties Questionnaire.