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Table 3 Comparison the distribution of the TPB constructs between intervention and control groups

From: Effect of educational intervention on safe traffic behaviors of high school male students in Iran, using the theory of planned behavior: a quasi-experimental study

Constructs of theory Group Before the intervention After the intervention *P-value
Mean (SD) Mean (SD)
Knowledge Intervention 2.39 (0.91) 4.49 (0.59) >  0.001
Control 2.47 (0.97) 2.53 (1.01) 0.395
**P-Value 0.553 >  0.001  
Attitude toward behavior Intervention 15.23 (3.17) 24.32 (3.32) >  0.001
Control 15.51 (4.20) 14.89 (3.38) 0.063
**P-Value 0.586 >  0.001  
Subjective norm Intervention 11.79 (4.02) 23.20 (3.73) >  0.001
Control 12.61 (4.83) 12.68 (4.60) 0.746
**P-Value 0.187 >  0.001  
Perceived behavior control Intervention 15.21 (2.73) 24.69 (2.68) >  0.001
Control 15.61 (3.92) 15.82 (3.64) 0.453
**P-Value 0.397 >  0.001  
Behavioral intention Intervention 7.73 (1.91) 12.67 (1.76) >  0.001
Control 7.93 (2.24) 8.05 (2.12) 0.411
**P-Value 0.503 >  0.001  
Behavior Intervention 8 (1.59) 13.07 (1.50) >  0.001
Control 8.17 (2.32) 8.08 (2.20) 0.563
**P-Value 0.528 >  0.001  
  1. *The results are related to paired sample t-test
  2. ** The results are related to independent sample t-test