Table 4 Comparison of the milk donation knowledge and TPB constructs between intervention and control groups

Knowledge

Before intervention

6.18

1.66

6.44

1.87

0.552^a

Immediately after intervention

9.45

0.83

6.38

2.06

 < 0.001^b

3 months after intervention

9.67

0.69

6.53

1.94

 < 0.001^b

P-value

 < 0.001^c

0.781^c

Attitude

Before intervention

47.36

7.29

46.68

9.05

0.734^a

Immediately after intervention

57.88

2.34

46.88

8.19

 < 0.001^b

3 months after intervention

57.42

2.8

47.12

8.73

 < 0.001^b

P-value

 < 0.001^c

0.783^c

Subjective norms

Before intervention

22.58

4.95

22.88

5.59

0.813^a

Immediately after intervention

30.58

4.16

22.21

5.16

 < 0.001^b

3 months after intervention

31.27

4.86

22.21

5.25

 < 0.001^b

P-value

 < 0.001^c

0.147^c

Perceived behavioral control

Before intervention

21.06

5.31

20.15

4.56

0.453^a

Immediately after intervention

29.94

4.68

19.44

4.06

 < 0.001^b

3 months after intervention

30.03

4.66

19.35

4.26

 < 0.001^b

P-value

 < 0.001^c

0.092^c

Intention to donate milk

Before intervention

16.7

6.27

15.56

6.68

0.476^a

Immediately after intervention

28.24

6.56

15.82

6.57

 < 0.001^b

3 months after intervention

28.03

6.71

15.24

5.93

 < 0.001^b

P-value

 < 0.001^c

0.858^c