Means and ranges of participant clinical characteristics
| Questionnaire | Score interpretation guidance | Mean, range |
|---|---|---|
| Beck Scale for Suicide Ideation30 | Higher scores indicate greater levels of suicidal ideation, possible score range 0–38. | 8.5, 0–24 |
| Sleep Condition Indicator31 | ≤16 indicates possible insomnia disorder, as per diagnostic and Statistical Manual of Mental Disorders V diagnostic criteria, possible score range 0–32. | 13.8, 4–32 |
| The Pittsburgh Sleep Quality Index32 | >5 indicates poor sleep quality, maximum score=21. | 9.9, 1–17.5 |
| Alcohol Use Disorders Identification Test-1033 | >7 indicates possible hazardous and harmful alcohol use, maximum score=40. | 6.8, 0–39 |
| Beck Depression Inventory-II34 | Higher scores indicate greater severity of depression, possible score range 0–63. | 23.0, 0–51 |
| State-Trait Anxiety Inventory-Trait portion35 | Higher scores indicate greater levels of anxiety, possible score range 20–80. | 55.3, 34–75 |
| Brief Sleep Screen36 | Assessment of symptoms present in other sleep disorders such as narcolepsy, sleep breathing disorder, periodic limb movement in sleep/ restless leg syndrome, circadian rhythm sleep disorder and parasomnia. | NA |
NA, not applicable.