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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)

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

  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