Table 3.
Unstandardized regression coefficients and standard errors for the final regression model examining the effect of participation in Health First at 6 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= 131) | −0.00 (0.02) | −0.40^ (0.21) | 0.04 (0.06) | −0.32** (0.12) | 1.33** (0.43) | −0.49** (0.18) | 0.32 | 9.86*** | .15b |
| Exercise self-efficacy (n= 137) | −0.03 (0.02) | −0.26 (0.16) | 0.08 (0.04) | −0.52*** (0.08) | 0.94** (0.32) | -- | 0.31 | 11.79*** | .04 |
| Self-efficacy for self- care (n=134) | −0.00 (0.01) | −0.07 (0.06) | −0.00 (0.02) | −0.71*** (0.13) | 0.07 (0.13) | -- | 0.41 | 17.8*** | .00 |
| Depressive symptoms (n= 119) | −0.02 (0.03) | 0.41 (0.23) | 0.00 (0.07) | −0.54*** (0.09) | −0.88^ (.049) | -- | 0.31 | 10.2*** | .02 |
| Perceived stress (n= 137) | 0.00 (0.00) | −0.00 (0.04) | −0.01 (0.01) | −0.28*** (0.08) | −0.16* (0.08) | -- | 0.14 | 4.08** | .03 |
| Subjective caregiver burden (n=123) | −0.04 (0.08) | 1.49* (0.72) | 0.29 (0.28) | −0.44*** (0.10) | −0.71 (1.46) | -- | 0.20 | 6.10*** | .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 < 0.10,
p < 0.05,
p < 0.01,
p < 0.001.
Treatment effect size is represented by squared semipartial coefficients for the treatment group.
Calculated for the group of participants who scored at or below the median total exercise score at baseline; n=80.