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Table 5 Direct and indirect effects of theory of planned behavior constructs and knowledge

From: Factors that influence dietary behavior toward iron and vitamin D consumption based on the theory of planned behavior in Iranian adolescent girls

Determinants or Predictors

Causal Effect

Direct

Indirect

Total effects

Knowledge→Intention*

–

0.340

0.340

Attitude →Intention*

0.180

–

0.180

Subjective norms→Intention*

0.147

–

0.147

Perceive behavior control→Intention**

0.830

–

0.830

knowledge→Perceive behavior control**

0.410

–

0.410

Through total causal effect

1.567

0.340

1.907

Percantage of indirect and indirects effects

1.567/1.907 = 82%

0.340/1.907 = 18%

 
  1. *p < 0.05, **p < 0.001