Table 7.

Correlation of different age groups with app usage frequency, brushing duration, and brushing frequency

		First follow-up (T1)		Second follow-up (T2)		Third follow-up (T3)
	Age group	15–18	>18	15–18	>18	15–18	>18
App usage frequency	Intervention group	1.50 ± 0.54	1.05 ± 0.66	1.45 ± 0.67	1.08 ± 0.66	1.44 ± 0.69	1.13 ± 0.7
	P-value*	0.005**		0.039**		0.092
Brushing frequency	Intervention group	1.96 ± 0.52	1.76 ± 0.58	1.86 ± 0.44	1.85 ± 0.47	1.87 ± 0.45	1.87 ± 0.57
	P-value*	0.170		0.965		0.985
	Control group	2.06 ± 0.92	1.9 ± 0.66	2.17 ± 0.96	1.9 ± 0.42	2.09 ± 0.96	1.73 ± 0.48
	P-value*	0.439		0.164		0.176
Brushing duration	Intervention group	4.06 ± 1.33	5.34 ± 4.11	3.81  ± 1.04	5 ± 3.28	3.89 ± 1.02	4.76 ± 3.41
	P-value*	0.092		0.051		0.165
	Control group	6.03 ± 6.04	3.99 ± 2.85	6.17 ± 5.97	4.08 ± 2.73	6.27 ± 6.32	3.85 ± 2.89
	P-value*	0.098		0.084		0.059

*Independent t-test.

**p-values are statistically significant.