Table 1.
Clinical and substance-related measures
| Morning-types (n = 13) | Evening-types (n = 21) | t | p | d | |
|---|---|---|---|---|---|
| DSM-IV Diagnoses | |||||
| Major Depressive Disorder | 1 current | 3 past | |||
| Alcohol Abuse | 1 past | 1 current, 1 past | |||
| Alcohol Dependence | none | none | |||
| Substance Abuse | 1 current | 3 current, 1 past | |||
| Substance Dependence | none | 1 current, 2 past | |||
| Beck Depression Inventory | 4.85 ± 7.78 | 5.19 ± 5.54 | 0.15 | ns | 0.06 |
| Sensation Seeking Scale | 9.08 ± 4.41 | 9.29 ± 3.41 | 0.16 | ns | 0.06 |
| Barrett Impulsiveness Scale | 54.77 ± 12.31 | 60.19 ± 8.65 | 1.51 | ns | 0.55 |
| Alcohol Dependence Scalea | 2.30 ± 1.77 | 5.00 ± 3.50 | 2.60 | 0.016 | 1.09 |
| Alcohol and Drug Consumption Quest. | |||||
| Alcohol | 3.38 ± 1.12 | 3.86 ± 1.74 | 0.87 | ns | 0.32 |
| Marijuana | 2.69 ± 2.53 | 3.81 ± 2.86 | 1.16 | ns | 0.43 |
| Tobacco | 4.77 ± 3.83 | 4.86 ± 3.37 | 0.07 | ns | 0.03 |
a
The ADS was completed by 10 Morning-types and 16 Evening-types.
Groups are based on extreme cases from an original sample of 118 male adolescents.
d = Cohen’s d effect size.