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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)

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

  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   
  1. #Independent t test
  2. Repeated ANOVA