Table 6.
Association between change of DBAS worry/helplessness subscale score and change of sleep and other outcomes
| DBAS worry/helplessness subscale score change by treatment interaction on outcome change | DBAS worry/helplessness subscale score (baseline to posttreatment) | Treatment (CBTI) | DBAS worry/helplessness subscale score change (baseline to posttreatment) × treatment | |
|---|---|---|---|---|
| PSQI change | Coefficient [95% CI] | −0.29 [−0.79, 0.21] | −1.63 [−2.85, −0.41] | 0.87 [0.25, 1.48] |
| p-value | .253 | .009 | .006 | |
| ISI change | Coefficient [95% CI] | −0.05 [−0.84, 0.73] | −2.91 [−4.83, −0.99] | 1.10 [0.13, 2.06] |
| p-value | .899 | .003 | .027 | |
| Sleep efficiency-D change | Coefficient [95% CI] | 1.03 [−1.11, 3.17] | 5.84 [0.49, 11.20] | −1.93 [−4.56, 0.71] |
| p-value | .342 | .033 | .151 | |
| WASO-D change | Coefficient [95% CI] | −4.51 [−11.93, 2.90] | −5.69 [−24.24, 12.87] | 8.05 [−1.09, 17.20] |
| p-value | .231 | .545 | .084 | |
| Sleep efficiency-A change | Coefficient [95% CI] | 0.27 [−0.50, 1.04] | −0.90 [−2.80, 1.00] | 0.26 [−0.70, 1.21] |
| p-value | .496 | .349 | .595 | |
| ESS change | Coefficient [95% CI] | −0.16 [−0.63, 0.32] | 0.05 [−1.11, 1.22] | 0.51 [−0.08, 1.09] |
| p-value | .509 | .927 | .091 | |
| FFS change | Coefficient [95% CI] | −0.43 [−1.42, 0.56] | −0.44 [−2.88, 1.99] | 2.27 [1.05, 3.50] |
| p-value | .391 | .721 | <.001 | |
| PHQ-9 change | Coefficient [95% CI] | 0.68 [0.09, 1.28] | −0.09 [−1.56, 1.37] | 0.32 [−0.42, 1.05] |
| p-value | .025 | .900 | .396 | |
| SF-12vs physical health change | Coefficient [95% CI] | −1.00 [−2.32, 0.31] | 0.70 [−2.50, 3.90] | −0.19 [−1.81, 1.42] |
| p-value | 0.133 | 0.666 | 0.813 | |
| SF-12vs mental health change | Coefficient [95% CI] | −1.03 [−2.35, 0.28] | −1.26 [−4.47, 1.96] | 0.99 [−0.63, 2.61] |
| p-value | 0.123 | 0.441 | 0.229 |
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.