Table 4.
Moderation analyses showing that neither sleep duration nor depression significantly moderated the association between insomnia and frequency of suicidal ideation in the replication sample (NHANES 2005–2006 cycle).
| OR | 95% CI | p-value | |
|---|---|---|---|
| Model 1 | |||
| Insomnia | 1.15 | 0.93–1.41 | 0.183 |
| Sleep duration (h) | |||
| <=4 | 8.22** | 2.51–26.92 | 0.002 |
| 5 | 2.16 | 0.63–7.38 | 0.195 |
| 6 | 1.34 | 0.35–5.16 | 0.647 |
| 7 | — | ||
| 8 | 2.17 | 0.74–6.39 | 0.141 |
| 9 | 6.39** | 1.87–21.79 | 0.007 |
| >=10 | 1.54 | 0.13–18.53 | 0.709 |
| Sleep duration X insomnia | |||
| <=4 | 0.86 | 0.66–1.12 | 0.237 |
| 5 | 1.00 | 0.77–1.30 | 0.979 |
| 6 | 0.99 | 0.75–1.31 | 0.950 |
| 7 | — | ||
| 8 | 0.92 | 0.71–1.20 | 0.517 |
| 9 | 0.82 | 0.62–1.09 | 0.150 |
| >=10 | 1.18 | 0.81–1.72 | 0.364 |
| Model 2 | |||
| Insomnia | 1.11* | 1.03–1.20 | 0.013 |
| Depression | 87.52*** | 17.63–434.39 | <0.001 |
| Depression X insomnia | 0.93 | 0.77–1.12 | 0.397 |
Each model includes adjustments for age, gender, race, education, poverty-to-income ratio, marital status, smoking status, alcohol consumption, and binge drinking. Model 1 is adjusted for depression and Model 2 is adjusted for sleep duration. N = 4,773. *p < 0.05, **p < 0.01, ***p < 0.001.