Table 4.
Unstandardized regression coefficients and standard errors for the final regression model examining the effect of participation in Health First at 12 months on study outcomes
| Outcome | Age | Illness count | Objective burden | Baseline outcome | Intervention group | Baseline outcome X Intervention group | Model R2 | F value | Treatment effect sizea |
|---|---|---|---|---|---|---|---|---|---|
| Total weekly exercise (n= 124) | −0.01 (0.02) | −0.07 (0.20) | −0.00 (0.06) | −0.42*** (0.10) | 0.34 (0.43) | -- | 0.16 | 4.40** | .00 |
| Exercise self-efficacy (n=122) | −0.02 (0.02) | −0.24 (0.16) | 0.07 (0.04) | −0.36*** (0.08) | 0.96** (0.33) | -- | 0.21 | 6.57*** | .05 |
| Self-efficacy for self-care (n=119) | −0.00 (0.01) | −0.01 (0.07) | −0.01 (0.02) | −0.61*** (0.09) | −0.03 (0.14) | -- | 0.32 | 11.1*** | .00 |
| Depressive symptoms (n= 117) | 0.00 (0.02) | 0.06 (0.20) | −0.09 (0.06) | −0.44*** (0.08) | −0.09 (0.44) | -- | 0.27 | 8.81*** | .00 |
| Perceived stress (n= 122) | 0.00 (0.33) | −0.01 (0.04) | −0.00 (0.01) | −0.19* (0.08) | 0.01 (0.08) | -- | 0.06 | 1.54 | .00 |
| Subjective caregiver burden (n= 108) | −0.05 (.12) | 0.74 (1.1) | 0.19 (0.45) | −0.60*** (0.16) | −1.0 (2.2) | -- | 0.23 | 6.12*** | .00 |
Note. For each model, an intervention group by baseline value of outcome interaction term was added as a final model-building step; where this did not result in a significant incremental increase in R2, it was omitted from the final model. Where this term was significant (i.e., total exercise/week), the model was re-estimated with the baseline total exercise centered on its mean.;
*
p < 0.05,
**
p < 0.01,
***
p < 0.001.
a
Treatment effect size is represented by squared semipartial coefficients for the treatment group.