Table 2.
Correlations among Covariates, Predictor and Outcome Variables
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
|---|---|---|---|---|---|---|---|---|
| 1. Age | - | |||||||
| 2. Level of Education | .60** | - | ||||||
| 3. Living at Home | −.40** | −.42** | - | |||||
| 4. Parent's Household Income | .08 | .14* | −.05 | - | ||||
| 5. Childhood ADHD | .06 | −.27** | .13* | −.07 | - | |||
| 6. Persistent Impulsivity | .02 | −.22** | .14* | −.05 | .58** | - | ||
| 7. CD/ASP | .09 | −.18** | −.06 | −.05 | .32** | .31** | - | |
| 8. Heavy Drinking | .22** | .19** | −.24** | −.02 | .03 | .14* | .24** | - |
| 9. Frequent Motorsports Involvement? | .14* | −.09 | −.08 | −.06 | .18** | .10 | .22** | .20** |
Notes: n=358, except for correlations with maternal-reported impulsivity (n=277); Level of education= did participant report any years of college education (0=no, 1=yes)?; Living at Home=Does participant live with parents (0=no, 1=yes)?; Childhood ADHD (0=Control, 1=ADHD); Persistent Impulsivity=Sum of items from Eysenck Impulsivity Scale; CD/ ASP=Did participant have conduct disorder (if 16/17 years-old) or antisocial personality disorder (if 18–25 years-old; 0=no, 1=yes)?; Heavy drinking=Mean of rate of binge drinking and/or drunkenness in past 12 months (0=Not at all to 11=Several times/day); Frequent Motorsports Involvement?=Did participant endorse regular involvement (“used to do it regularly” or “do it now, very often”) in at least one motorsport (0=no, 1=yes)?
p < .05;
p < .01