Table 2.
Mean differences in measures as a function of driving after drinking, by subgroup
| Gender |
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|---|---|---|---|---|---|---|---|---|---|---|
| Male |
Female |
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| No (n = 938) |
Yes (n = 227) |
No (n = 1,470) |
Yes (n = 213) |
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| Measure | M | SD | M | SD | t test | M | SD | M | SD | t test |
| Total weekly drinks | 6.44 | 9.96 | 16.34 | 13.07 | 12.59*** | 3.75 | 4.96 | 10.03 | 8.24 | 15.64*** |
| Self-approval | 1.12 | 0.46 | 1.86 | 1.10 | 15.59*** | 1.12 | 0.49 | 1.67 | 1.04 | 12.69*** |
| Typical student misperception | 0.36 | 0.86 | 0.67 | 1.02 | 4.75*** | 0.66 | 1.02 | 0.79 | 1.12 | 1.82 |
| Typical same-sex student misperception |
0.51 | 0.99 | 0.82 | 1.14 | 4.09*** | 0.47 | 0.92 | 0.56 | 1.06 | 1.23 |
| Age (years) |
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|---|---|---|---|---|---|---|---|---|---|---|
| 21 and older |
Younger than 21 |
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| No (n = 761) |
Yes (n = 229) |
No (n = 1,647) |
Yes (n = 211) |
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| M | SD | M | SD | t test | M | SD | M | SD | t test | |
| Total weekly drinks | 5.27 | 7.15 | 11.88 | 9.95 | 11.18*** | 4.59 | 7.57 | 14.75 | 12.61 | 16.79*** |
| Self-approval | 1.17 | 0.57 | 1.76 | 0.99 | 11.42*** | 1.10 | 0.43 | 1.75 | 1.16 | 15.98*** |
| Typical student misperception | 0.64 | 0.97 | 0.86 | 1.09 | 2.9** | 0.49 | 0.97 | 0.61 | 1.04 | 1.70 |
| Race |
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|---|---|---|---|---|---|---|---|---|---|---|
| Caucasian |
Non-Caucasian |
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| No (n = 1,527) |
Yes (n = 310) |
No (n = 881) |
Yes (n = 130) |
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| M | SD | M | SD | t test | M | SD | M | SD | t test | |
| Total weekly drinks | 5.94 | 8.34 | 14.85 | 11.83 | 15.95*** | 2.81 | 4.96 | 9.35 | 9.12 | 12.29*** |
| Self-approval | 1.10 | 0.42 | 1.77 | 1.08 | 18.44*** | 1.16 | 0.57 | 1.73 | 1.07 | 9.40*** |
| Typical student misperception | 0.48 | 0.91 | 0.72 | 1.06 | 4.05*** | 0.64 | 1.07 | 0.80 | 1.11 | 1.64 |
| Greek affiliation |
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|---|---|---|---|---|---|---|---|---|---|---|
| Greek |
Non-Greek |
|||||||||
| No (n = 470) |
Yes (n = 150) |
No (n = 1,938) |
Yes (n = 290) |
|||||||
| M | SD | M | SD | t test | M | SD | M | SD | t test | |
| Total weekly drinks | 9.83 | 10.22 | 16.32 | 12.84 | 6.34*** | 3.58 | 6.00 | 11.68 | 10.22 | 19.34*** |
| Self-approval | 1.10 | 0.44 | 1.62 | 1.03 | 8.71*** | 1.12 | 0.49 | 1.82 | 1.09 | 18.63*** |
| Typical student misperception | 0.47 | 1.03 | 0.70 | 1.09 | 1.72 | 0.59 | 0.98 | 0.88 | 1.10 | 4.60*** |
| Typical Greek student misperception |
0.32 | 0.91 | 0.47 | 0.97 | 2.38* | n/a | n/a | n/a | n/a | n/a |
| Family history of alcohol abuse |
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|---|---|---|---|---|---|---|---|---|---|---|
| FH+ |
FH− |
|||||||||
| No (n = 787) |
Yes (n = 194) |
No (n = 1621) |
Yes (n = 246) |
|||||||
| M | SD | M | SD | t test | M | SD | M | SD | t test | |
| Total weekly drinks | 5.51 | 8.48 | 13.36 | 11.15 | 0.83*** | 4.45 | 6.86 | 13.16 | 11.57 | 6.73*** |
| Self-approval | 1.11 | 0.46 | 1.61 | 0.96 | 0.53*** | 1.13 | 0.49 | 1.87 | 1.14 | 7.82*** |
| Typical student misperception | 0.53 | 0.99 | 0.56 | 0.96 | 0.38 | 0.54 | 0.97 | 0.88 | 1.14 | 5.03*** |
Note. The driving after drinking variable represents driving after more than two drinks. All the measures are phrased in terms of drinking after driving, except for total weekly drinks.
*
p < .05;
**
p < .01;
***
p < .001.