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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