Table 3.
Pearson correlations between change of DBAS scores and change of sleep and other health outcomes
| Variable | DBAS-16 | ||||
|---|---|---|---|---|---|
| Overall score | Subscale 1: consequences | Subscale 2: worry/helplessness | Subscale 3: expectation | Subscale 4: medication | |
| PSQI score | 0.280** | 0.190* | 0.193* | 0.218** | 0.258** |
| ISI score | 0.356** | 0.244** | 0.270** | 0.287** | 0.272** |
| Sleep efficiency-D | −0.138 | −0.094 | −0.065 | −0.094 | −0.207* |
| WASO-D | 0.104 | 0.116 | 0.046 | 0.076 | 0.067 |
| Sleep efficiency-A | 0.148 | 0.131 | 0.177* | 0.076 | -0.024 |
| ESS | 0.176* | 0.190* | 0.110 | 0.180* | 0.007 |
| FFS | 0.355** | 0.265** | 0.301** | 0.285** | 0.170 |
| PHQ-9 | 0.423** | 0.327** | 0.404** | 0.180* | 0.248** |
| SF-12vs physical health | −0.183* | −0.142 | −0.250** | 0.022 | −0.045 |
| SF-12vs mental health | −0.119 | −0.093 | −0.069 | −0.047 | −0.176* |
*p < .05, **p < .01.
DBAS, Dysfunctional Beliefs and Attitudes about Sleep; PSQI, Pittsburgh Sleep Quality Index; ISI, Insomnia Severity Index; sleep efficiency-D, sleep diary measured sleep efficiency; WASO-D, sleep diary measured wake after sleep onset; sleep efficiency-A, actigraphy measured sleep efficiency; ESS, Epworth Sleepiness Scale; FFS, Flinders Fatigue Scale; PHQ-9, Patient Health Questionnaire-9 items; SF-12, Medical Outcomes Study 12-item Short-Form health-related quality of life.