Table 1. Descriptive Statistics at Baseline, Daily, Weekday, and Weekend for Participants and Peers.
| Baseline Variables | M (SD) | Range | Percent |
|---|---|---|---|
| Age | 18.84 (1.14) | 18–24 | -- |
| White | -- | -- | 76.6% |
| Female | -- | -- | 50% |
| Trauma - Lifetime | 1.70 (1.89) | 0–9 | -- |
| PTSD Diagnosis | -- | -- | 16.4% |
| PTSD Symptom Count | 3.57 (4.56) | 0–17 | -- |
| PCL-C Total Score | 31.59 (14.39) | 17–82 | -- |
| Past 30-day Drinks Per Occasion | 5.52 (1.80) | 1–9 | -- |
| Past 30-day Drinking Occasions | 2.71 (.87) | 1–5 | -- |
| Binge Once/Week | -- | -- | 44% |
| Past 30-day Alcohol Consequences | 8.82 (8.22) | 0–48 | -- |
| Listed 3 Supportive Peers | -- | -- | 80% |
| Supportive Peer Past 30-day Drinks Per Occasion | 4.96 (1.92) | 0–9 | -- |
| Supportive Peer Past 30-day Drinking Occasions | 2.34 (0.88) | 0–7 | -- |
| Listed 3 Other Friends/Acquaintances | -- | -- | 80% |
| Friends/Acquaintances Past 30-day Drinks Per Occasion | 5.25 (1.74) | 1–9 | -- |
| Friends/Acquaintances Past 30-day Drinking Occasions | 2.67 (0.81) | 0–7 | -- |
|
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| Daily, Weekday, and Weekend Variables | |||
|
| |||
| Daily PTSD symptom severity | 4.27 (9.35) | 0–68 | -- |
| Weekday PTSD symptom severity | 5.09 (9.25) | 0–46 | -- |
| Weekend PTSD symptom severity | 4.49 (9.90) | 0–68 | -- |
| Daily drinks | .96 (2.52) | 0–15 | -- |
|
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| Daily drinks on drinking days | 5.52 (3.38) | 1–15 | -- |
|
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| Weekday drinks | .40 (1.61) | 0–15 | -- |
|
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| Weekday drinks on drinking days | 1.60 (1.71) | .20–10.33 | -- |
|
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| Weekend drinks | 2.54 (3.69) | 0–15 | -- |
|
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| Weekend drinks on drinking weekends | 4.61 (2.93) | .50–15 | -- |
|
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| Daily consequences | .53 (2.11) | 0–24 | -- |
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| Daily consequences on drinking days | 2.88 (4.16) | 0–24 | -- |
|
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| Weekday consequences | .29 (1.75) | 0–24 | -- |
|
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| Weekday consequences on drinking days | 1.14 (2.66) | 0–18 | -- |
|
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| Weekend consequences | 1.20 (2.77) | 0–24 | -- |
|
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| Weekend consequences on drinking weekends | 2.23 (3.04) | 0–17.50 | -- |
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| Daily drinks: Supportive peers | 4.95 (3.28) | 1–15 | -- |
| Weekday drinks: Supportive peers | 3.90 (3.36) | 1–15 | -- |
| Weekend drinks: Supportive peers | 5.62 (3.06) | 1–15 | -- |
| Supportive peer acceptability of drinking | 2.45 (0.81) | 0–3 | -- |
| Weekday acceptability: Supportive peers | 2.21 (.96) | 0–3 | -- |
| Weekend acceptability: Supportive peers | 2.57 (.68) | 0–3 | -- |
| Daily drinks: Friends/Acquaintances | 6.13 (3.21) | 1–15 | -- |
| Weekday drinks: Friends/Acquaintances | 5.31 (3.40) | 1–15 | -- |
| Weekend drinks: Friends/Acquaintances | 6.50 (3.06) | 1–15 | -- |
| Friends/Acquaintances acceptability of drinking | 2.45 (0.83) | 0–3 | -- |
| Weekday acceptability: Friends/Acquaintances | 2.07 (.99) | 0–3 | -- |
| Weekend acceptability: Friends/Acquaintances | 2.60 (.70) | 0–3 | -- |
Note. Final sample = 128. PTSD = Posttraumatic Stress Disorder; PCL-C = PTSD Checklist-Civilian Version; Weekday = Sunday–Thursday; Weekend = Friday–Saturday. Baseline variables capture behavior over the previous 30 days.