Table 2 Comparison of the planned behavior theory components between intervention and control groups

Knowledge

Before Intervention

Mean ± S.D.

Four weeks after the Intervention

Mean ± S.D.

Eight weeks after the Intervention

Mean ± S.D.

P*

Intervention group

27.55±1.6

37.67±2.28

42.13±2.28

<0.001

Control group

26.62±2.18

27.48±2.69

28.62±3.06

0.48

P**

0.46

<0.001

<0.001

Attitude

Before Intervention

Mean ± S.D.

Four weeks after the Intervention

Mean ± S.D.

Eight weeks after the Intervention

Mean ± S.D.

P*

Intervention group

18.25±1.90

20.44±2.23

22.02±1.70

<0.01

Control group

18.31±1.81

18.32±1.90

18.32±2.22

0.49

P**

0.885

<0. 01

<0.001

Subjective norms

Before Intervention

Mean ± S.D.

Four weeks after the Intervention

Mean ± S.D.

Eight weeks after the Intervention

Mean ± S.D.

P*

Intervention group

12.02±3.80

15.25±1.31

15.71±3.66

<0.01

Control group

12.57±4.01

12.71±1.29

12.88±2.54

0.29

P**

0.564

<0. 01

<0.001

Behavioral intention

Before Intervention

(yes percent)

Four weeks after the Intervention

(yes percent)

Eight weeks after the Intervention

(yes percent)

P*

Intervention group

33.3%

34.1%

35.2%

<0.01

Control group

34.3%

29.5%

26%

0.39

P***

0.932

<0. 001

<0.001