Table 3.

Comparison of mean knowledge, attitude, and practice (KAP) at different time intervals using post hoc Tukey’s test among a sample of 12–15-year-old students in Nepal (N = 202)

	Time intervals		Mean difference ± SE	P value	95% confidence interval
					Lower bound	Upper bound
Oral hygiene knowledge	Baseline	3 months	− 3.00 ± 0.20	< 0.001	− 3.41	− 2.58
		6 months	− 4.23 ± 0.19	< 0.001	− 4.61	− 3.84
	3 months	6 months	− 1.23 ± 0.17	< 0.001	− 1.58	− 0.88
Oral hygiene practice	Baseline	3 months	− 0.91 ± 0.14	< 0.001	− 1.19	− 0.64
		6 months	− 1.08 ± 0.15	< 0.001	− 1.37	− 0.78
	3 months	6 months	− 0.16 ± 0.14	0.27	− 0.45	0.12
Oral hygiene attitude	Baseline	3 months	− 0.33 ± 0.09	0.001	− 0.52	− 0.14
		6 months	− 0.92 ± 0.10	< 0.001	− 1.13	− 0.72
	3 months	6 months	− 0.59 ± 0.09	< 0.001	− 0.77	− 0.41
Overall KAP	Baseline	3 months	− 4.26 ± 0.26	< 0.001	− 4.78	− 3.74
		6 months	− 6.24 ± 0.27	< 0.001	− 6.78	− 5.69
	3 months	6 months	− 1.98 ± 0.26	< 0.001	− 2.49	− 1.46