Table 1.
Prevalence, mean levels, and age of onset of substance dependence, adversity, mood disorder, and conduct problems, by tribe and gender (with 95% confidence intervals), accounting for sampling weights.
| Southwest
|
Northern Plains
|
|||
|---|---|---|---|---|
| Males | Females | Males | Females | |
| Prevalence (%) of DSM-IV substance dependence | 19.7 (16.6–23.2) | 6.0 (4.5–7.9) | 21.6 (18.7–24.9) | 15.1 (12.6–17.9) |
| Prevalence (%) of adversity | 85.2 (82.0–87.9) | 87.6 (85.1–89.7) | 83.1 (80.0–85.8) | 88.4 (85.9–90.5) |
| Prevalence (%) of DSM-IV mood disorder | 19.4 (16.4–22.9) | 28.1 (25.0–31.4) | 14.7 (12.2–17.5) | 25.7 (22.7–29.0) |
| Age of first substance dependence symptom | 19.3 (18.6–20.0) | 19.6 (18.7–20.4) | 18.8 (18.2–19.5) | 20.1 (19.3–20.8) |
| Age of first adverse experience | 11.0 (10.2–11.8) | 10.1 (9.4–10.7) | 10.2 (9.5–10.8) | 9.4 (8.8–9.9) |
| Age of first mood symptom | 22.1 (20.5–23.8) | 25.2 (24.0–26.4) | 25.3 (23.2–27.4) | 26.0 (24.4–27.6) |
| Mean conduct disorder problems (before age 15) | .31 (.28–.34) | .15 (.14–.17) | .32 (.30–.35) | .23 (.20–.25) |
| Mean number of reported adversities | 3.53 (3.3–3.8) | 3.86 (3.6–4.1) | 4.28 (4.0–4.6) | 4.60 (4.3–4.9) |