Table 2.
Multivariable logistic regression models, insomnia diagnosis, 2005–2009 (n = 66,869).
| Variable | Model 1 | Model 2 | Model 3 | |||
|---|---|---|---|---|---|---|
| OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| Age, y | ||||||
| 18–24 | Ref | Ref | Ref | |||
| ≥25 | 1.02 | .91–1.15 | 1.02 | .91–1.15 | 1.02 | .89–1.17 |
| Rank | ||||||
| E1–E5 | Ref | Ref | Ref | |||
| E6–E9 | .93 | .80–1.08 | .91 | .78–1.06 | .93 | .78–1.11 |
| Service branch | ||||||
| U.S. Marine Corps | Ref | Ref | Ref | |||
| U.S. Navy | 1.04 | .91–1.20 | 1.02 | .88–1.18 | .97 | .82–1.15 |
| Marital status | ||||||
| Not married | Ref | Ref | Ref | |||
| Married | 1.09 | 1.00–1.19 | 1.11 | 1.01–1.21*** | 1.07 | .96–1.19 |
| Sex | ||||||
| Male | Ref | Ref | Ref | |||
| Female | 1.37 | 1.15–1.64* | 1.48 | 1.23–1.76* | 1.63 | 1.34–1.98* |
| Previous combat deployment | ||||||
| No | – | Ref | Ref | |||
| Yes | .91 | .83–.99*** | .91 | .82–1.01 | ||
| Combat exposures | ||||||
| 0 | – | Ref | Ref | |||
| 1 | 1.41 | 1.26–1.57* | 1.31 | 1.15–1.48* | ||
| 2–3 | 2.03 | 1.82–2.26* | 1.50 | 1.29–1.73* | ||
| Deployment location | ||||||
| Kuwait | – | Ref | Ref | |||
| Iraq/Afghanistan | .93 | .85–1.01 | .90 | .81–1.00 | ||
| Long deployment (> 213 days) | ||||||
| No | – | Ref | Ref | |||
| Yes | 1.24 | 1.12–1.36* | 1.14 | 1.01–1.27*** | ||
| Military occupation | ||||||
| Infantry | Ref | Ref | Ref | |||
| Equipment repair | .87 | .77–.99 | 1.06 | .93–1.21 | 1.10 | .94–1.27 |
| Law enforcement | 1.61 | 1.27–2.03* | 1.62 | 1.28–2.04* | 1.58 | 1.19–2.11** |
| Motor transport | 1.29 | 1.07–1.55** | 1.38 | 1.14–1.66* | 1.50 | 1.20–1.86* |
| Health care | 2.26 | 1.87–2.74* | 2.24 | 1.85–2.71* | 2.37 | 1.88–2.97* |
| Administration | .82 | .70–.96*** | .96 | .81–1.14 | .96 | .79–1.16 |
| Intelligence | .75 | .62–.90** | .84 | .70–1.02 | .88 | .71–1.09 |
| Craftsworkers | .63 | .50–.79* | .78 | .62–.98*** | .80 | .62–1.04 |
| Other | .89 | .75–1.06 | .99 | .83–1.19 | 1.07 | .87–1.30 |
Model 1 = demographics only; Model 2 = all variables; Model 3 = all variables excluding 8,947 personnel who reported at least 1 PTSD symptom on the PDHA. *P < .001. **P = .001–.009. ***P = .01 to P < .05. CI = confidence interval, OR = odds ratio, PDHA = Post-Deployment Health Assessment, PTSD = posttraumatic stress disorder, Ref = referent.