Table 2.
Sociodemographic and clinical characteristics of patients
| Primary insomnia group (n = 126) | Insomnia related to a mental disorder group (n = 61) | P value | |
|---|---|---|---|
| Age, mean (SD), y | 48.07 (15.02) | 45.21 (13.44) | 0.212a |
| Education duration, mean (SD), y | 15.35 (3.14) | 14.77 (2.84) | 0.194b |
| Sex, No. (%), Female | 91 (72.2) | 35 (58.3) | 0.058 |
| Ethnic group, No. (%) | 0.298 | ||
| Caucasian | 80 (63.5) | 31 (51.7) | |
| African American | 39 (31.0) | 24 (40.0) | |
| Other | 7 (5.6) | 5 (8.3) | |
| Marital status, No. (%) | 0.001 | ||
| Single | 32 (25.4) | 27 (45.0) | |
| Married or live-in partner | 71 (56.3) | 16 (26.7) | |
| Separated, divorced, or widowed | 23 (18.3) | 17 (28.3) | |
| Beck Anxiety Inventory (BAI) | 9.02 (7.14) | 14.18 (10.07) | < 0.001b |
| Beck Depression Inventory (BDI) | 13.86 (9.46) | 19.38 (11.00) | 0.001a |
| Pre-sleep cognitive arousal (PSAS-COG) | 18.42 (7.56) | 21.64 (7.10) | 0.008a |
| Pre-sleep somatic arousal (PSAS-SOM) | 11.48 (3.96) | 13.91 (4.65) | < 0.001b |
| Fatigue Severity Scale (FSS) | 4.21 (1.41) | 4.54 (1.55) | 0.168a |
| Epworth Sleepiness Scale (ESS) | 8.57 (4.79) | 9.17 (5.25) | 0.444a |
| Sleep medication use, nights/month, mean (SD) | 7.38 (10.97) | 10.13 (12.54) | 0.148a |
| Medication use for anxiety or depression, No. (%) | 23 (18.5) | 27 (44.3) | < 0.001 |
a
P value from a t-test analysis.
b
P value from a Mann-Whitney analysis.