Table 1.
Means and standard deviations of participants' demographics, psychiatric variables and total PSQI score are presented for the full sample, those without clinically meaningful insomnia, and those with insomnia
| Full sample | No insomnia (n = 61) | Insomnia (n = 239) | Statistical test | |
|---|---|---|---|---|
| Age, M (SD) | 31.0 (10.5) | 28.6 (9.1) | 32.3 (11) | t = −1.93; P = 0.05 |
| Male, % (N) | 73.6 (217) | 80.4 (45) | 72.0 (172) | χ2 = 1.64; P = 0.2 |
| White, % (N) | 55.4 (163) | 60.0 (33) | 54.4 (130) | χ2 = 0.57; P = 0.45 |
| African American, % (N) | 24.5 (72) | 12.7 (7) | 27.2 (65) | χ2 = 5.06; P = 0.02 |
| Asian, % (N) | 8.2 (27) | 12.7 (7) | 8.4 (20) | χ2 = 1.01; P = 0.31 |
| Latino, % (N) | 22.5 (66) | 27.3 (15) | 21.3 (51) | χ2 = 0.90; P = 0.34 |
| Native American, % (N) | 6.5 (19) | 3.6 (2) | 7.1 (17) | χ2 = 0.89; P = 0.34 |
| Employed, % (N) | 66 (194) | 34.6 (19) | 27.6 (81) | χ2 = 2.43; P = 0.29 |
| DPDD, M (SD) | 7.1 (4.6) | 6.8 (3.9) | 7.4 (5.1) | t = −0.74; P = 0.46 |
| Drinking days, M (SD) | 18.1 (7.2) | 16.6 (7.1) | 18.4 (7.2) | t = −1.88; P = 0.06 |
| Binge drinking days, M (SD) | 12.23 (8.1) | 11.2 (7.8) | 12.5 (8.2) | t = −1.05; P = 0.29 |
| Dependence, % (N) | 72 (213) | 62.3 (38) | 74.5 (175) | χ2 = 3.56; P = 0.06 |
| DSM-IV symptom count, M (SD) | 5.3 (2.8) | 4.5 (2.5) | 5.5 (2.9) | t = −2.5; P = 0.01 |
| BDI-II score (SD) | 21.6 (12.7) | 15.3 (10.4) | 23.4 (13.3) | t = −4.13; P < 0.001 |
| BAI score (SD) | 18.9 (12.9) | 14.2 (11.8) | 20.2 (13.2) | t = −3.08; P = 0.002 |
| ADS score (SD) | 15.4 (7.4) | 12.2 (5.8) | 16.3 (7.7) | t = −3.69; P < 0.001 |
| DRINC score (SD) | 41.3 (22.5) | 30.5 (13.4) | 43.8 (23.5) | t = −4.05; P < 0.001 |
| DRINC physical consequences (SD) |
15.2 (3.3) | 14.1 (2.3) | 15.4 (3.5) | t = −2.74; P = 0.007 |
| DRINC intrapersonal consequences (SD) |
16.6 (4.0) | 14.7 (2.9) | 17.0 (4.0) | t = −3.92; P < 0.001 |
| DRINC social consequences (SD) |
14.4 (3.3) | 12.7 (2.5) | 14.7 (3.4) | t = −4.19; P < 0.001 |
| DRINC interpersonal consequences (SD) |
18.6 (5.3) | 16.2 (3.4) | 19.1 (5.6) | t = −3.79; P < 0.001 |
| DRINC impulse consequences score (SD) |
20.5 (5.7) | 18.0 (3.3) | 21.0 (6.0) | t = −3.64; P < 0.001 |
| CIWA score (SD) | 5.7 (6.9) | 3.9 (4.3) | 6.1 (7.6) | t = −2.26; P = 0.02 |
| FTND score (SD) | 11.3 (1.8) | 11.7 (1.7) | 11.2 (1.9) | t = 1.43; P = 0.16 |
| PSQI global score (SD) | 7.4 (3.3) | 3.2 (1.1) | 8.4 (2.8) | t = −14.19; P < 0.001 |
| PSQI Factor 1 Sleep efficiency | 1.3 (1.1) | 0.7 (1.1) | 1.5 (1.0) | t = −5.1; P < 0.001 |
| PSQI Factor 2 Sleep quality | 1.1 (0.6) | 0.5 (0.3) | 1.2 (0.6) | t = −9.6; P < 0.001 |
| PSQI Factor 3 Daily disturbances | 1.1 (0.6) | 0.6 (0.4) | 1.3 (0.5) | t = −10.4; P < 0.001 |
| Sleep duration | 6.5 (2.0) | 7.6 (1.8) | 6.2 (1.9) | t = 4.8; P < 0.001 |