Table 2.
Adjusted differences on the ISI by diagnosis.
| No diagnosis | Worried well | GAD only | GAD and depression | df | F | p | Post hoc | ||
|---|---|---|---|---|---|---|---|---|---|
| Difficulty falling asleep | |||||||||
| M (SD) | 0.79 | 1.13 | 1.69 | 1.75 | 3, 95 | 2.72 | .049 | No sig. | |
| (0.29) | (0.21) | (0.22) | (0.25) | diff. | |||||
| % moderate/severe problems | 21.1% | 25.0% | 58.6% | 64.0% | |||||
| Difficulty staying asleep | |||||||||
| M (SD) | 1.11 | 1.66 | 2.26 | 2.51 | 3, 97 | 7.34 | < .001 | 1 vs. 3 | |
| (0.24) | (0.17) | (0.18) | (0.21) | 1 vs. 4 | |||||
| 2 vs. 4 | |||||||||
| % moderate/severe problems | 21.1% | 60.6% | 83.3% | 88.0% | |||||
| Difficulty waking up too early | |||||||||
| M (SD) | 1.04 | 1.58 | 2.14 | 2.41 | 3, 96 | 4.62 | .005 | 1 vs. 3 | |
| (0.29) | (0.21) | (0.21) | (0.25) | 1 vs. 4 | |||||
| % moderate/severe problems | 36.8% | 51.5% | 73.3% | 75.0% | |||||
| Dissatisfied | |||||||||
| M (SD) | 1.68 | 2.38 | 2.77 | 2.97 | 3, 99 | 4.84 | .003 | 1 vs. 3 | |
| (0.26) | (0.20) | (0.20) | (0.23) | 1 vs. 4 | |||||
| % moderate/severe problems | 50.0% | 84.4% | 90.3% | 92.0% | |||||
| Interference | |||||||||
| M (SD) | 0.81 | 1.36 | 2.18 | 2.41 | 3, 100 | 9.79 | < .001 | 1 vs. 3 | |
| (0.24) | (0.18) | (0.18) | (0.22) | 1 vs. 4 | |||||
| 2 vs. 3 | |||||||||
| 2 vs. 4 | |||||||||
| % moderate/severe problems | 23.8% | 36.4% | 77.4% | 84.0% | |||||
| Noticeable | |||||||||
| M (SD) | 0.54 | 0.88 | 1.28 | 1.82 | 3, 100 | 6.19 | .001 | 1 vs. 4 | |
| (0.22) | (0.17) | (0.17) | (0.20) | 2 vs. 4 | |||||
| % moderate/severe problems | 9.5% | 18.2% | 45.2% | 76.0% | |||||
| Distressed | |||||||||
| M (SD) | 0.23 | 1.42 | 2.08 | 2.68 | 3, 100 | 19.67 | < .001 | 1 vs. 2 | |
| (0.23) | (0.18) | (0.18) | (0.21) | 1 vs. 3 | |||||
| 1 vs. 4 | |||||||||
| 2 vs. 4 | |||||||||
| % moderate/severe problems | 9.5% | 45.5% | 67.7% | 88.0% | |||||
| Total ISI score | |||||||||
| M (SD) | 6.63 | 10.41 | 14.35 | 16.53 | 3, 100 | 12.20 | < .001 | 1 vs. 3 | |
| (1.28) | (0.98) | (0.99) | (1.17) | 1 vs. 4 | |||||
| 2 vs. 3 | |||||||||
| 2 vs. 4 | |||||||||
| % moderate/severe insomnia | 4.8% | 16.1% | 51.6% | 68.0% | |||||
Note. 1 = no diagnosis; 2 = worried well; 3 = GAD; 4 = GAD and comorbid depression; analyses were adjusted for age, gender, gastrointestinal diseases, pulmonary diseases, and benzodiazepine use.