Table 4.
Clinical correlates by insomnia disorder
| Characteristics | ISI < 11 | ISI ≥ 11 | Stats | Effect size Cohen’s d/Cramer’s V |
|---|---|---|---|---|
| # of Deployments | 1.89 (1.21) | 1.96 (1.24) | t = −1.47 (p = 1.41) | r = 0.06 |
| Combat exposure | X2 = 132.06 (p < 0.001)* | V = 0.16 | ||
| Yes | 35.6% | 64.4% | ||
| No | 50.9% | 49.1% | ||
| PTSD | X2 = 1,445.16 (p < 0.001)* | V = 0.52 | ||
| PCL+ | 6.7% | 93.3% | ||
| PCL− | 61.1% | 38.9% | ||
| Depression | X2 = 970.37 (p < 0.001)* | V = 0.42 | ||
| PHQ9+ | 5.0% | 95.0% | ||
| PHQ9− | 54.3% | 45.7% | ||
| Suicidal ideation | X2 = 356.98 (p < 0.001)* | V = 0.25 | ||
| Ideation+ | 12.3% | 87.7% | ||
| Ideation− | 47.9% | 52.1% | ||
| Alcohol misuse | X2 = 1.89 (p = 0.17) | V = 0.04 | ||
| Audit+ | 48.7% | 51.3% | ||
| Audit− | 53.0% | 47.0% | ||
| TBI | X2 = 57.58 (p < 0.001)* | V = 0.16 | ||
| TBI+ | 22.3% | 77.7% | ||
| TBI− | 39.0% | 61.0% | ||
| MST | X2 = 4.87 (p = 0.02)* | V = 0.70 | ||
| MST+ | 39.9% | 61.0% | ||
| MST− | 51.7% | 48.3% | ||
| Pain | X2 = 489.70 (p < 0.001)* | V = 0.35 | ||
| Pain+ | 29.5% | 69.6% | ||
| Pain− | 66.8% | 33.2% |
*
Significant p < 0.05.
ISI, insomnia severity index; MST, military sexual trauma; PTSD, posttraumatic stress disorder; PCL, PTSD checklist; TBI, traumatic brain injury; PHQ9, patient health questionnaire 9-Item depression module; Audit, alcohol use disorders identification test.