Table 1.
Sample Characteristics and Intercorrelations (n=969)
| Variables | Overall % or Mean (SD) | Correlation Matrix
|
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | ||
| 1 Sex (% Male) | 45% | |||||||||||||
| 2 Race (% white) | 72% | .06 | ||||||||||||
| 3 Alcohol intoxication by age 15 | 37% | .08 | .18 | |||||||||||
| 4 Mother’s alcohol problems | 0.1 (0.3) | −.03 | .09 | .02 | ||||||||||
| 5 Father’s alcohol problems | 0.2 (0.6) | −.03 | −.01 | −.02 | .16 | |||||||||
| 6 Impulsive sensation-seeking | 3.5 (2.2) | .09 | .05 | .24 | .05 | .05 | ||||||||
| 7 Childhood conduct problems | 6.6 (4.7) | .34 | −.03 | .23 | .04 | .05 | .23 | |||||||
| 8 Depression symptoms | 5.3 (5.0) | −.14 | −.08 | .01 | .10 | .09 | .02 | .13 | ||||||
| 9 Other caffeine consumption [(ounces/week)*10] | 15.8 (11.6) | −.04 | .12 | .04 | .05 | .05 | .05 | .01 | .04 | |||||
| 10 Frequency of energy drink consumption without alcohol (days/year) | 11.2 (30.3) | .13 | <.01 | .09 | .03 | .02 | .12 | .09 | .04 | .16 | ||||
| 11 Frequency of energy drink consumption with alcohol (days/year) | 4.9 (12.9) | .10 | .07 | .15 | <.01 | .01 | .11 | .07 | −.03 | .09 | .45 | |||
| 12 Alcohol frequency [(days/year)*10] | 8.9 (6.5) | .13 | .19 | .15 | −.01 | .01 | .19 | .13 | −.07 | .09 | .03 | .04 | ||
| 13 Alcohol quantity (typical number of drinks per drinking day) | 3.3 (2.5) | .32 | .16 | .21 | .02 | <.01 | .21 | .14 | −.10 | .03 | .18 | .36 | .33 | |
| 14 Drunk driving frequency score | 0.4 (0.9) | .16 | −.01 | .15 | .03 | .06 | .13 | .13 | .02 | .07 | .20 | .19 | .29 | .32 |
Note. Results reported as Pearson correlation coefficients. All |r| ≥.069 were statistically significant (p<.05) and are denoted in bold. Sex was coded as 0 (female) and 1 (male); race as 0 (non-white) and 1 (white); first drunk as 0 (age 16 or older) and 1 (age 15 or younger); and parents’ alcohol problems as 0 (none), 1 (possible) and 2 (definite). Other caffeine consumption and alcohol use frequency were both rescaled by a factor of 10.