Table 3.
Comparison of predicted multivariable risk of developing insomnia among covariates.
| Model 1 | Model 2 | Model 3 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| HR | 95% CI | P | HR | 95% CI | P | HR | 95% CI | P | |
| Index age | 0.99 | 0.93–1.06 | .782 | 0.96 | 0.88–1.03 | .236 | 1.03 | 0.94–1.12 | .531 |
| Race/ethnicity | |||||||||
| NH White | 1.00 | — | — | 1.00 | — | — | 1.00 | — | — |
| Hispanic | 1.07 | 0.95–1.21 | .280 | 1.08 | 0.93–1.25 | .298 | 1.16 | 0.98–1.37 | .085 |
| NH Black | 0.70 | 0.62–0.79 | < .001 | 0.75 | 0.64–0.86 | < .001 | 0.98 | 0.83–1.17 | .834 |
| Asian/PI | 0.78 | 0.62–0.98 | .031 | 0.90 | 0.68–1.18 | .436 | 0.89 | 0.97–1.20 | .453 |
| Other | 0.95 | 0.72–1.26 | .726 | 1.12 | 0.82–1.54 | .476 | 1.10 | 0.77–1.59 | .593 |
| Rank | |||||||||
| Junior enlisted | 1.00 | — | — | 1.00 | — | — | 1.00 | — | — |
| Senior enlisted | 1.14 | 1.03–1.27 | .015 | 1.23 | 1.07–1.40 | .003 | 1.01 | 0.87–1.17 | .924 |
| Officer | 0.48 | 0.40–0.59 | < .001 | 0.68 | 0.53–0.86 | .001 | 0.61 | 0.46–0.81 | < .001 |
| Marital status | |||||||||
| Single | 1.00 | — | — | 1.00 | — | — | 1.00 | — | — |
| Married | 1.27 | 1.13–1.35 | < .001 | 1.24 | 1.12–1.38 | <.001 | 1.25 | 1.11–1.40 | < .001 |
| Mental health/health behaviors | |||||||||
| PTSD | 2.42 | 2.14–2.72 | < .001 | 1.41 | 1.22–1.62 | < .001 | |||
| Depression | 1.56 | 1.37–1.79 | < .001 | 1.65 | 1.41–1.92 | < .001 | |||
| Anxiety | 2.57 | 2.26–2.92 | < .001 | 2.19 | 1.90–2.53 | < .001 | |||
| Alcohol dependence | 1.15 | 1.00–1.34 | .053 | 1.26 | 1.07–1.49 | .005 | |||
| Opioid dependence | 1.83 | 1.25–2.66 | .002 | 1.54 | 1.02–2.31 | .039 | |||
| Obesity | 1.21 | 1.06–1.38 | .006 | 1.18 | 1.01–1.37 | .043 | |||
| Cohort | |||||||||
| Uninjured | 1.00 | — | — | ||||||
| Injured | 1.43 | 1.30–1.58 | < .001 | ||||||
| Injury subtypes | |||||||||
| Traumatic brain injury | |||||||||
| Mild/unclassified | 2.07 | 1.82–2.35 | < .001 | ||||||
| Mod/sev/penetrating | 2.43 | 2.06–2.86 | < .001 | ||||||
| Burn | 1.95 | 1.47–2.59 | < .001 | ||||||
| Amputation | 1.61 | 1.26–2.06 | < .001 | ||||||
Hazard Ratio of 1.00 denotes value used as a baseline reference variable for the multivariable analysis. Dashes represent values which could not be calculated for reference variables. CI = confidence interval, HR = hazard ratio, Mod = moderate, NH = non-Hispanic, PI = Pacific Islander, PTSD = posttraumatic stress disorder, sev = severe, TBI = traumatic brain injury.