Table 5.
Mediated effect and asymmetric confidence intervals (αβ)
| Variable | Intention-to-treat analysis | Per-protocol analysis | ||||||
|---|---|---|---|---|---|---|---|---|
| αβ | ProdLower | ProdUpper | 95% CI | αβ | ProdLower | ProdUpper | 95% CI | |
| Physical activity | .07 | -1.87 | 2.40 | -.28 to .51 | .01 | -2.09 | 2.12 | -.90 to .94 |
| Portion size | .18 | -1.60 | 2.47 | -.24 to .84 | .17 | -1.70 | 2.48 | -.37 to .96 |
| Total energy | -.13 | -2.47 | 1.69 | -.73 to .27 | -.06 | -2.35 | 1.99 | -.71 to .48 |
| Alcohol | -.08 | -2.33 | 1.94 | -.68 to .41 | -.03 | -2.29 | 2.07 | -.41 to .32 |
| Total fat | -.46 | -2.33 | 1.64 | -1.51 to .28 | -.51 | -2.44 | 1.51 | -1.87 to .33 |
Abbreviations: αβ = product of coefficients estimate; ProdUpper and ProdLower represent the upper and lower critical values obtained from the PRODCLIN program; 95% CI = 95% asymmetric confidence intervals for the mediated effect obtained from the PRODCLIN program.