Table 2.
Sample Characteristics by Study Technology Condition and Overall
| Variable | Smartphone Breathalyzer Cond. (n= 33) | BAC Estimator Condition (n= 33) |
Self-Texting Condition (n= 33) |
Overall (N= 99) |
|---|---|---|---|---|
| Percent male | 45.5% | 60.6% | 48.5% | 50.5% |
| Age | 22.67(1.29) | 23.03(1.02) | 22.79(1.39) | 22.83(1.24) |
| Race/ethnicity | ||||
| White non-Hispanic/Latino/a | 63.6% | 66.7% | 60.6% | 63.6% |
| Black/A-A, non-Hispanic/Latino/a | 6.1% | 0% | 3% | 3% |
| Hispanic/Latino/a | 18.2% | 21.2% | 21.2% | 20.2% |
| Asian | 6.1% | 9.1% | 9.1% | 8.1% |
| Other | 3% | 3% | 0% | 2% |
| Did not report | 3% | 0% | 6.1% | 3% |
| Non-student status | 51.5% | 54.5% | 48.5% | 51.5% |
| Current at least weekly smoker | 15.2% | 15.2% | 15.2% | 15.2% |
| Family history of alcohol problems | 21.2% | 48.5% | 33.3% | 34.3% |
| Alcohol abuse (lifetime/current) | 51.5/30.3% | 36.4/21.2% | 45.5/24.2% | 44.4/25.3% |
| Alc. dependence (LT/current) | 42.4/21.2% | 39.4/21.2% | 42.4/24.2% | 41.4/22.2% |
| Past 30-day alcohol frequency/quantity reported at screening: mean (SD), range of responses | ||||
| Frequency of any use | 16.55(4.32) 10 – 26 |
16.97(6.41) 10 – 30 |
15.42(5.15) 10 – 29 |
16.31(5.35) 10 – 30 |
| Drinks per week | 21.76(11.02) 9.57 – 56.93 |
22.51(13.36) 8.40 – 61.83 |
20.72(12.54) 7 – 66.27 |
21.66(12.24) 7 – 66.27 |
| Drinks per drinking day | 5.71(2.78) 2.62 – 15.6 |
5.60(2.01) 2.32 – 12.05 |
5.57(2.05) 2.73 – 12.91 |
5.63(2.29) 2.32 – 15.6 |
| Frequency of heavy drinking days | 9.45(4.84) | 10.30(5.63) | 8.55(3.71) | 9.43(4.80) |
| 4–23 | 4–23 | 4–18 | 4–23 | |
| Mean eBAC | .15% (.05%) .07%−.31% |
.14% (.04%) .06%−.26% |
.14% (.05%) .08%−.27% |
.14% (.05%) .06%−.31% |
| Peak eBAC | .35% (.12%) 0.20%−.83% |
.30% (.12%) 0.17%−0.70% |
.34% (.11%) .17%−.58% |
.33% (.12%) .17%−.83% |
| Peak drinking (number of drinks) | 13.55 (5.62) 6–30 |
11.97 (5.15) 6–25 |
13.36 (5.66) 6–26 |
12.96 (5.47) 6–30 |
Notes. A-A= African-American, eBAC = estimated blood alcohol concentration, heavy drinking day = 5 or more for men, 4 or more for women. There were no statistically significant differences across study technology condition for any of these variables.