Table 5.
HR with 95% CI of death by suicide among subjects with different combinations of self-reported depressive symptoms and nightmares, compared to those who never or seldom experience depressive symptoms or nightmares.
| Depressive symptoms | Nightmares | N | Person years | Deaths (%) | P value for mortality rate difference | HR (95% CI)a | HR (95% CI)b |
|---|---|---|---|---|---|---|---|
| Never, seldom | Never/seldom | 15,716 | 298,394 | 10 (0.06) | 0.91 | 1.0 (reference) | 1.0 (reference) |
| Never, seldom | Sometimes/often/always | 1829 | 33,663 | 1 (0.05) | 0.98 (0.12–7.48) | 0.94 (0.11–6.69) | |
| Sometimes | Never/seldom | 15,802 | 301,377 | 36 (0.23) | 0.95 | 4.47 (2.21–9.04) | 3.90 (1.92–7.92) |
| Sometimes | Sometimes/often/always | 4990 | 94,167 | 11 (0.22) | 4.95 (2.09–11.7) | 3.61 (1.49–8.71) | |
| Often, always | Never/seldom | 1481 | 28,617 | 6 (0.41) | 0.83 | 9.23 (3.32–25.6) | 6.01 (2.13–17.4) |
| Often, always | Sometimes/often/always | 1084 | 20,937 | 5 (0.46) | 12.4 (4.16–36.8) | 5.66 (1.78–18.0) |
We used the test-based method to calculate p values.
a
Adjusted for gender.
b
Adjusted for gender, occupational status, educational status, smoking, sleep duration, hypnotic use, cardiovascular disease, and self-reported anxiety symptoms.