Table 4:
Weighted incidence densities of mental disorders attributed at least partially to the Afghanistan mission, by demographic and military characteristics
| Characteristic* | Weighted† incidence density, no. per 1000 person-years (95% CI) |
|---|---|
| Sex | |
| Male | 31.8 (28.0–35.9) |
| Female | 39.6 (27.4–53.9) |
| Age, yr‡ | |
| < 30 | 40.3 (32.9–48.0) |
| 30–39 | 28.9 (23.8–34.6) |
| ≥ 40 | 27.7 (20.0–37.0) |
| Component | |
| Regular Forces | 31.9 (28.1–35.7) |
| Reserve Forces | 39.8 (22.2–62.6) |
| Element§ | |
| Land | 44.2 (38.6–50.5) |
| Sea | 18.5 (11.4–27.5) |
| Air | 15.7 (10.5–21.8) |
| Rank¶ | |
| Officer | 21.4 (13.6–30.6) |
| Senior NCM | 31.5 (23.2–41.0) |
| Junior NCM | 35.4 (30.5–40.5) |
| Deployment location** | |
| Kandahar | 65.5 (55.6–76.2) |
| Kabul | 29.3 (22.2–38.0) |
| United Arab Emirates | 8.6 (3.2–14.9) |
| Arabian Gulf | 14.6 (7.6–23.3) |
| Multiple locations | 26.9 (21.6–32.8) |
| Unspecified | 19.2 (12.1–28.4) |
| No. of deployments†† | |
| 1 | 34.0 (29.2–39.0) |
| 2 | 31.3 (24.3–39.7) |
| ≥ 3 | 17.0 (9.4–26.5) |
| Duration of first deployment, d | |
| < 180 | 28.7 (24.4–33.4) |
| 180–365 | 40.8 (33.4–48.6) |
| > 365 | 17.0 (0.0–48.5) |
| Total duration of all deployments, d | |
| < 180 | 29.0 (23.7–34.5) |
| 180–365 | 38.3 (31.9–45.2) |
| > 365 | 25.9 (17.8–36.3) |
| Overall | 32.5 (28.8–36.5) |
Note: CI = confidence interval, deployment = deployment in support of Afghanistan mission, NCM = noncommissioned officer.
Two-sample Z tests were used to compare differences in incidence density between variable levels; significance set at p < 0.05 after Bonferroni correction.
Sample design weights and bootstrap methods were used to compute the incidence density estimates and associated 95% CIs for the entire study population.
p < 0.05 for difference between groups aged < 30 and 30–39 yr.
p < 0.05 for differences between Land and Sea Forces and between Land and Air Forces.
p < 0.05 for difference between officers and junior NCM ranks.
p < 0.05 for differences between Kandahar and each of the other locations, between Kabul and United Arab Emirates, and between “multiple locations” category and United Arab Emirates.
p < 0.05 for differences between ≥ 3 deployments and 1 deployment, and between ≥ 3 deployments and 2 deployments.