Table 7.
Association between change of DBAS expectations subscale score and change of sleep and other outcomes
| DBAS expectations subscale score change by treatment interaction on outcome change | DBAS expectations subscale score (baseline to posttreatment) | Treatment (CBTI) | DBAS expectations subscale score change (baseline to posttreatment) × treatment | |
|---|---|---|---|---|
| PSQI change | Coefficient [95% CI] | 0.03 [−0.42, 0.48] | −1.95 [−3.19, −0.71] | 0.20 [−0.31, 0.72] |
| p-value | .894 | .002 | .434 | |
| ISI change | Coefficient [95% CI] | 0.02 [−0.69, 0.72] | −3.07 [−5.01, −1.14] | 0.55 [−0.25, 1.35] |
| p-value | .961 | .002 | .177 | |
| Sleep efficiency-D change | Coefficient [95% CI] | 0.66 [−1.30, 2.63] | 6.33 [0.93, 11.74] | −1.08 [−3.31, 1.16] |
| p-value | .505 | .022 | .341 | |
| WASO-D change | Coefficient [95% CI] | −5.32 [−12.06, 1.43] | −5.36 [−23.89, 13.18] | 8.03 [0.36, 15.71] |
| p-value | .121 | .568 | .040 | |
| Sleep efficiency-A change | Coefficient [95% CI] | 0.02 [−0.66, 0.71] | −1.12 [−3.03, 0.79] | 0.09 [−0.70, 0.88] |
| p-value | .949 | .247 | .824 | |
| ESS change | Coefficient [95% CI] | −0.06 [−0.48, 0.36] | 0.10 [−1.05, 1.25] | 0.34 [−0.14, 0.81] |
| p-value | .786 | .864 | .161 | |
| FFS change | Coefficient [95% CI] | −0.33 [−1.24, 0.58] | −0.93 [−3.42, 1.55] | 1.31 [0.28, 2.34] |
| p-value | .471 | .459 | .013 | |
| PHQ-9 change | Coefficient [95% CI] | −0.16 [−0.72, 0.40] | −0.22 [−1.76, 1.32] | 0.55 [−0.09, 1.19] |
| p-value | 0.566 | 0.778 | 0.093 | |
| SF-12vs physical health change | Coefficient [95% CI] | 0.97 [−0.22, 2.15] | 1.23 [−2.02, 4.49] | −1.05 [−2.40, 0.30] |
| p-value | .110 | .456 | .126 | |
| SF-12vs mental health change | Coefficient [95% CI] | 0.08 [−1.09, 1.26] | −2.19 [−5.40, 1.02] | −0.42 [−1.75, 0.91] |
| p-value | .887 | .179 | .531 |
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.