Table 4.
Univariate and Multivariate Regression Analysis of Selected Outcome Variables (change, Week 9 − Week 1) in Relation to Treatment Effect
| Outcome | Treatment effecta | SE | p Value | Adjusted treatment effecta | SE | p Value |
| Perceived Stress Scale | −5.8 | 2.3 | .014 | −5.7 | 1.9 | .006 |
| Center for Epidemiological Studies–Depression | −6.0 | 2.9 | .045 | −6.4 | 2.5 | .015 |
| SF-36 | ||||||
| Bodily pain | 19.3 | 7.7 | .016 | 15.7 | 7.0 | .03 |
| General health | 17.4 | 6.5 | .011 | 17.1 | 5.4 | .003 |
| Vitality | 16.9 | 7.7 | .034 | 20.4 | 6.2 | .002 |
| Social functioning | 11.2 | 7.6 | .15 | 16.6 | 7.0 | .023 |
| Role emotional | −31.3 | 12.9 | .02 | −35.4 | 9.8 | .001 |
Note: a“Treatment effect” is the unadjusted regression coefficient of the treatment variable. “Adjusted treatment effect” is the coefficient of treatment from the multivariate model including treatment and potential confounding variables (see text). The baseline value of the outcome variable is the only adjustment variable included for all models, except Salish/non-Salish membership is also included for the SF-36 role-emotional outcome.