Table 2.

The intracluster and intercluster comparison of oral health knowledge score between the two clusters

	Knowledge score Mean ± SD
Cluster	Baseline	6 weeks	12 weeks	P value
Leaflet Cluster	54.94 ± 12.74	82.87 ± 10.69	89.12 ± 8.16	F = 665.67; P < 0.001*
E-learning Cluster	55.50 ± 9.93	72.16 ± 10.25	74.66 ± 8.98	F = 223.39; P < 0.001*
Significance	t = − 0.35; P = 0.73**	t = 7.24; P < 0.001**	t = 11.92; P < 0.001**

*One way repeated measures ANOVA was applied to compare the mean differences of knowledge score within the same cluster

**Independent samples t-test was applied to compare the mean differences of knowledge score between the two clusters at baseline, 6 weeks and 12 weeks