| Diagnosis of Insomnia Disorder (n = 34) | No Diagnosis of Insomnia Disorder (n = 67) | Statistics | P Value | |
|---|---|---|---|---|
| Mean age, years (SD) | 47.69 (11.0) | 49.66 (15.5) | t = −0.65 | .521 |
| Female sex | 25 (73.5) | 41 (61.2) | χ2 = 1.52 | .218 |
| Uses prescribed medication for sleep | 5 (14.7) | 4 (6.0) | χ2 = 2.12 | .145 |
| Psychiatric disorder* | 20 (58.8) | 10 (14.9) | χ2 = 20.82 | .000 |
| Major depressive episode | 12 (35.3) | 3 (4.5) | ||
| Generalized anxiety disorder | 8 (23.4) | 4 (6.0) | ||
| Agoraphobia | 6 (17.7) | 1 (1.5) | ||
| Social phobia | 5 (14.7) | 1 (1.5) | ||
| Alcohol dependence | 3 (8.8) | 0 (0) | ||
| Substance abuse | 2 (5.9) | 2 (3.0) | ||
| Posttraumatic stress disorder | 2 (5.9) | 2 (3.0) | ||
| Obsessive-compulsive disorder | 2 (5.9) | 0 (0) | ||
| Panic disorder | 2 (5.9) | 2 (3.0) | ||
| Dysthymic disorder | 1 (2.9) | 0 (0) | ||
| Medical disorder | 16 (47.1) | 42 (62.7) | χ2 = 1.83 | .176 |
| Condition interfering with sleep | 10 (29.4) | 10 (14.9) |
Data are n (%) unless otherwise indicated.
↵* The total percentage exceeds 100% because some participants have more than one diagnosis.
SD, standard deviation.