Table 4.
Final regression models showing the relationship between weight change and vitality change for both phases of the study
| Variables | Phase 1 vitality changea |
Phase 2 vitality changeb |
||
|---|---|---|---|---|
| Regression coefficient (95% CI) | P-value | Regression coefficient (95% CI) | P-value | |
| Phase 1 weight change (kg) | −2.05 (−2.93, −1.17) | < 0.001 | ||
| Vitality baseline scorec | −0.50 (−0.65, −0.34) | < 0.001 | ||
| Phase 2 weight change (kg) | −0.50 (−1.12, 0.12) | 0.11 | ||
| Vitality baseline scorec | 0.37 (0.20, 0.53) | < 0.001 | ||
| Vitality score at the beginning of Phase 2 | −0.61 (−0.79, −0.43) | < 0.001 | ||
The dependent variables were the Phase 1 or Phase 2 vitality change score; the independent variables were the Phase 1 weight change and the Phase 2 weight change, respectively. For both phases, potential confounders tested included age, gender, education, occupation, marital status, self-rated health, presence of obesity-related comorbidities, age when first overweight, expected weight loss, number of prior weight loss programs (see Table 1 and text for more details)
The final model included Phase 1 weight change and vitality baseline score; N = 86; R-squared = 0.41
The final model included the vitality score at the beginning of Phase 2 and the vitality baseline score; N = 81; R-squared = 0.40
Vitality baseline score refers to the vitality score at the beginning of Phase 1