Table 3 |
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|
Mediation effects of changes in psychosocial factors on changes in fat intake |
||||||
|
Psychosocial factor |
Single-mediator models |
|||||
|
α(SE) |
β(SE) |
αβ(SE) |
95% CI of αβ |
z |
% mediated effect |
|
|
|
||||||
|
Attitude |
-0.004 (0.031) |
-7.773 (2.077)*** |
0.031 (0.241) |
-0.441, 0.503 |
0.129 |
statistical suppressiona |
|
Self-efficacy |
-0.020 (0.077) |
-1.790 (1.581) |
0.036 (0.139) |
-0.236, 0.308 |
0.258 |
statistical suppressiona |
|
Social support |
0.005 (0.098) |
-2.548 (1.732) |
-0.013 (0.250) |
-0.502, 0.477 |
-0.051 |
0.1 |
|
Perceived benefits |
0.069 (0.039) |
-1.799 (2.997) |
-0.124 (0.113) |
-0.345, 0.097 |
-1.099 |
1.4 |
|
Perceived barriers |
0.067 (0.022)** |
2.260 (1.493) |
0.151 (0.060)* |
0.034, 0.268 |
2.535 |
suppression |
|
|
||||||
|
Multiple-mediator model |
||||||
|
α(SE) |
β(SE) |
αβ(SE) |
95% CI of αβ |
z |
% mediated effect |
|
|
|
||||||
|
Attitude |
-0.004 (0.031) |
-6.966 (1.866)*** |
0.028 (0.054) |
-0.078, 0.134 |
0.515 |
statistical suppressiona |
|
Self-efficacy |
-0.020 (0.077) |
-0.379 (1.941) |
0.008 (0.040) |
-0.070, 0.085 |
0.191 |
statistical suppressiona |
|
Social support |
0.005 (0.098) |
-1.643 (2.177) |
-0.008 (0.037) |
-0.080, 0.060 |
-0.223 |
0.1 |
|
Perceived benefits |
0.069 (0.039) |
-0.144 (3.055) |
-0.010 (0.211) |
-0.423, 0.403 |
-0.047 |
0.1 |
|
Perceived barriers |
0.067 (0.022)** |
0.786 (1.741) |
0.053 (0.117) |
-0.177, 0.282 |
0.450 |
statistical suppressiona |
|
|
||||||
|
α estimate of intervention effect (unstandardized regression coefficient) on residualized change score of psychosocial factors β estimate of the independent effect of the mediator (unstandardized regression coefficient of residualized change scores) on residualized change score for fat intake αβ product-of-coefficient estimate; mediated effect SE standard error 95% CI of αβ 95% confidence interval of the mediated effect z standard deviate associated with mediated effect (used for significance testing) * significant at the 5% probability level, ** significant at the 1% probability level; *** significant at the 0.1% probability level a Statistical suppression refers to a statistically non-significant indirect effect that is opposite in sign to the intervention effect |
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|
Haerens et al. International Journal of Behavioral Nutrition and Physical Activity 2007 4:55 doi:10.1186/1479-5868-4-55 |
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