Effectiveness of oral health education intervention among 12–15-year-old school children in Dharan, Nepal: a randomized controlled trial

Table 2 Intragroup and intergroup comparisons of knowledge, attitude, and practice (KAP) regarding on oral hygiene in control and experimental group at baseline, 3 and 6 months after intervention (N = 202)

	Experimental group (mean ± SD)	Control group (mean ± SD)	T value	P^# value
Mean oral hygiene knowledge
Baseline	5.47 ± 1.80	5.75 ± 2.0	1.015	0.312
3 months	8.47 ± 1.52	6.07 ± 1.78	− 10.263	0.001
6 months	9.71 ± 1.10	6.13 ± 1.71	− 17.748	0.001
F value	253.689	2.302
P^∆ value	0.001	0.107
% change	77.51	6.6
Mean oral hygiene practice
Baseline	3.42 ± 1.34	3.45 ± 1.144	0.127	0.899
3 months	4.34 ± 1.45	3.46 ± 1.15	− 4.799	0.001
6 months	4.51 ± 1.03	3.18 ± 1.31	− 7.926	0.001
F value	32.215	2.254
P^∆ value	0.001	0.108
% change	31.87	− 7.82
Mean oral hygiene attitude
Baseline	2.56 ± 0.84	2.63 ± 0.86	0.627	0.531
3 months	2.89 ± 0.79	2.72 ± 0.79	− 1.522	0.130
6 months	3.48 ± 0.69	2.50 ± 0.79	− 9.368	0.001
F value	47.375	3.291
P^∆ value	0.001	0.039
% change	35.93	− 4.94
Overall oral hygiene KAP
Baseline	11.45 ± 2.52	11.83 ± 2.80	0.325	0.371
3 months	15.72 ± 2.48	12.24 ± 2.55	− 9.790	0.001
6 months	17.70 ± 2.03	11.82 ± 2.70	− 17.520	0.001
F value	286.823	1.472
P^∆ value	0.001	0.232
% change	54.58	− 0.084

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