Table 1.
Means and standard deviations of sleep, clinical, and demographic variables by group.
| Low suicidal ideation
|
High Suicidal Ideation
|
|||
|---|---|---|---|---|
| (n =47) |
(n =37) |
|||
| Mean or n | SD or % | Mean or n | SD or % | |
| Age | 26.1 | 6.1 | 27.3 | 8.0 |
| Sex (n = female) | 24 | 51.1% | 21 | 56.8% |
| QIDSa | 11.2 | 3.7 | 17.4 | 4.6 |
| QIDSb | 9.8 | 3.6 | 13.7 | 4.3 |
| Insomnia symptomsc | 3.4 | 2.0 | 4.2 | 2.4 |
| Total sleep time (min) | 434.9 | 31.7 | 410.6 | 35.2 |
| Sleep latency (min) | 9.7 | 8.8 | 10.4 | 8.8 |
| Sleep efficiency (%) | 93.5% | 4.8% | 93.7% | 5.7% |
| Awake and movement (%) | 3.6% | 2.3% | 3.2% | 1.5% |
| NREM Stage 1 (%) | 4.5% | 3.4% | 3.7% | 2.8% |
| NREM Stage 2 (%) | 53.0% | 7.8% | 53.1% | 6.5% |
| NREM SWS (%) | 14.8% | 8.0% | 16.2% | 7.3% |
| REM % | 24.0% | 5.6% | 24.2% | 4.3% |
| REM Latency (min) | 87.3 | 36.0 | 74.9 | 31.0 |
QIDS: Quick Inventory of Depressive Symptomatology;
a
Full QIDS composite, range 0–27;
b
QIDS composite with sleep and suicidal items removed, range 0–21;
c
Insomnia symptom questions from the QIDS, range 0–9; REM: rapid eye movement sleep; NREM: non-rapid eye movement sleep; SWS: slow-wave sleep.