Table 2. Bivariate Analyses of Participants' Demographic Characteristics and Alcohol Use by the Experience of Any Blackouts During Years 4 to 6.
| Participant characteristics (N = 1,145) | Blackouts Yes (n = 792) | Blackouts No (n = 353) | p-Value |
|---|---|---|---|
| Demographics | |||
| Female | 534 (67.4%) | 243 (68.8%) | 0.636 |
| Age at Year 4 | 21.8 (0.3) | 21.7 (0.4) | 0.158 |
| Caucasian | 514 (64.9%) | 198 (56.1%) | 0.005 |
| Alcohol use | |||
| Age at first drink | 16.0 (2.5) | 17.3 (2.6) | <0.001 |
| Age at first higha | 16.8 (2.1) | 18.0 (2.1) | <0.001 |
| Age at first drunka | 17.1 (2.1) | 18.1 (1.9) | <0.001 |
| Year 4 binge drinkingb | 6.8 (8.7) | 1.0 (2.5) | <0.001 |
| Year 5 binge drinkingb | 5.5 (7.8) | 1.0 (2.6) | <0.001 |
| Year 6 binge drinkingb | 4.7 (7.4) | 0.8 (2.6) | <0.001 |
a
Among only those reporting an age at first high or first drunk.
b
Number of binge drinking episodes in the past 3 months at each year. n(%) or mean (SD).