Table 2 Comparison of the mean pre- and post-test overall scores of parents’ knowledge and caregiving performance within and between the intervention and control groups

Overall score of parents’ knowledge

pre-test

37.97

4.67

39.38

4.94

0.20^*

post-test

52.64

3.02

38.51

3.73

<0.001^*

P-value

<0.001^**

0.40^**

P-covariance

<0.001*

Effect size

0.82**

Overall score of parents’ caregiving performance

pre-test

24

4.12

23.51

4.97

0.63^*

post-test

32.23

2.27

22.66

3.73

<0.001^*

P-value

<0.001^**

0.27^**

P-covariance

<0.001

Effect size

0.73