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Table 4 Intragroup and intergroup comparisons of mean plaque index and gingival index scores in control and experimental group (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 plaque index scores
 Baseline 2.15 ± 0.52 2.19 ± 0.41 0.493 0.622
 3 months 1.44 ± 0.46 2.23 ± 0.49 11.687 0.001
 6 months 0.91 ± 0.40 2.09 ± 0.53 17.558 0.001
 F value 275.518 3.732   
 P value 0.001 0.026   
 % change 57.67 4.56   
Mean gingival index scores
 Baseline 1.32 ± 0.25 1.36 ± 0.21 1.192 0.235
 3 months 0.86 ± 0.30 1.30 ± 0.26 11.123 0.001
 6 months 0.78 ± 0.31 1.35 ± 0.22 14.793 0.001
 F value 190.801 2.948   
 P value 0.001 0.05   
 % change 40.90 0.7   
  1. #Independent t test
  2. Repeated ANOVA