Table III.
Cognitive change predicting next winter follow-up SIGH-SAD scores: Intent-to-treat analyses
| b | S.E. | t | p | |
|---|---|---|---|---|
| Intercept | 12.15 | 5.33 | 2.28 | 0.03 |
| Baseline SIGH-SAD score | 0.14 | 0.18 | 0.74 | 0.46 |
| CBT vs. LT | −5.92 | 3.03 | −1.96 | 0.06 |
| CBT+LT vs. LT | −2.43 | 3.18 | −0.76 | 0.45 |
| DAS change | 0.04 | 0.11 | 0.34 | 0.74 |
| CBT vs. LT * DAS change | −0.15 | 0.12 | −1.29 | 0.20 |
| CBT+LT vs. LT * DAS change | −0.09 | 0.13 | −0.68 | 0.50 |
| Intercept | 10.69 | 5.53 | 1.93 | 0.06 |
| Baseline SIGH-SAD score | 0.06 | 0.18 | 0.31 | 0.76 |
| CBT vs. LT | −1.04 | 3.34 | −0.31 | 0.76 |
| CBT+LT vs. LT | −1.17 | 3.61 | −0.32 | 0.75 |
| ATQ change | 0.24 | 0.11 | 2.10 | 0.06 |
| CBT vs. LT * ATQ change | −0.32 | 0.12 | −2.72 | 0.01 |
| CBT+LT vs. LT * ATQ change | −0.18 | 0.14 | −1.24 | 0.23 |
| Intercept | 14.13 | 5.08 | 2.78 | 0.01 |
| Baseline SIGH-SAD score | 0.09 | 0.18 | 0.49 | 0.63 |
| CBT vs. LT | −6.13 | 2.56 | −2.39 | 0.02 |
| CBT+LT vs. LT | −4.18 | 2.80 | −1.49 | 0.14 |
| RSQ – Rum change | −0.17 | 0.18 | −0.95 | 0.36 |
| CBT vs. LT * RSQ – Rum change | 0.01 | 0.21 | 0.03 | 0.98 |
| CBT+LT vs. LT * RSQ – Rum change | 0.04 | 0.25 | 0.17 | 0.87 |
| Intercept | 15.27 | 5.06 | 3.02 | < 0.01 |
| Baseline SIGH-SAD score | 0.03 | 0.18 | 0.14 | 0.89 |
| CBT vs. LT | −6.58 | 2.57 | −2.56 | 0.02 |
| CBT+LT vs. LT | −3.86 | 2.51 | −1.54 | 0.13 |
| RSQ – Dis change | −0.23 | 0.43 | −0.52 | 0.61 |
| CBT vs. LT * RSQ – Dis change | 0.41 | 0.48 | 0.86 | 0.40 |
| CBT+LT vs. LT * RSQ - Dis change | 0.12 | 0.50 | 0.24 | 0.81 |
Note. CBT = cognitive-behavioral therapy, LT = light therapy; CBT+LT = CBT-plus-light therapy; DAS = Dysfunctional Attitude Scale; ATQ = Automatic Thoughts Questionnaire; RSQ - Rum = Response Styles Questionnaire–Rumination Subscale; RSQ - Dis = Response Styles Questionnaire–Distraction Subscale; SIGH SAD = Structured Interview Guide for the Hamilton Rating Scale for Depression-Seasonal Affective Disorder Version.