Table 4: Distribution and comparison of responses for the knowledge questionnaire of III- and V-grade children in all three schools
| School I | School II | School III | |||||||||||||||||
| Questions | III grade | V grade | pa-value | III grade | V grade | pa-value | III grade | V grade | pa-value | ||||||||||
| Mouth is an important part of the body | |||||||||||||||||||
| (a) True | 76.1 | 87.0 | 0.331 | 83.5 | 89.5 | 0.279 | 89.8 | 83.1 | 0.404 | ||||||||||
| (b) False | 14.7 | 6.5 | 9.8 | 4.2 | 4.2 | 6.2 | |||||||||||||
| (c) Do not know | 9.2 | 6.5 | 6.8 | 6.3 | 5.4 | 10.2 | |||||||||||||
| Brushing your teeth twice daily can cause tooth decay | |||||||||||||||||||
| (a) True | 11.9 | 8.1 | 0.649 | 2.3 | 3.2 | 0.716 | 12.7 | 3.1 | 0.09 | ||||||||||
| (b) False | 84.4 | 90.3 | 94 | 94.7 | 85.6 | 92.3 | |||||||||||||
| (c) Do not know | 3.7 | 1.6 | 3.8 | 2.1 | 0.8 | 4.6 | |||||||||||||
| Regular visit to the dentist helps to keep your teeth healthy | |||||||||||||||||||
| (a) True | 91.7 | 95.2 | 0.661 | 89.5 | 91.6 | 0.866 | 86.4 | 80.0 | 0.244 | ||||||||||
| (b) False | 6.4 | 3.2 | 6.8 | 5.3 | 7.6 | 9.2 | |||||||||||||
| (c) Do not know | 1.8 | 1.6 | 3.8 | 3.2 | 6.0 | 10.8 | |||||||||||||
| Eating sweets, candies, and chocolates does not cause tooth decay | |||||||||||||||||||
| (a) True | 8.3 | 3.2 | 0.321 | 3.8 | 1.10 | 0.265 | 10.2 | 4.6 | 0.263 | ||||||||||
| (b) False | 90.8 | 96.8 | 94 | 98.9 | 87.3 | 93.8 | |||||||||||||
| (c) Do not know | 0.9 | 0 | 2.30 | 0 | 2.5 | 1.60 | |||||||||||||
| Fizzy/carbonated drinks and frequent snacking are not good for teeth | |||||||||||||||||||
| (a) Yes | 45.9 | 69.4 | <0.001 | 44.4 | 56.8 | 0.173 | 40.7 | 60 | 0.014 | ||||||||||
| (b) No | 35.8 | 8.1 | 24.8 | 14.7 | 35.6 | 27.7 | |||||||||||||
| (c) Sometimes | 13.8 | 11.3 | 17.3 | 13.7 | 5.1 | 7.7 | |||||||||||||
| (d) I do not know | 4.6 | 11.3 | 13.5 | 14.7 | 18.6 | 4.6 | |||||||||||||
| Is it necessary to clean your tongue regularly? | |||||||||||||||||||
| (a) Yes | 79.8 | 85.2 | 0.436 | 87.2 | 85.3 | 0.939 | 83.9 | 87.7 | 0.461 | ||||||||||
| (b) No | 7.3 | 6.5 | 4.5 | 4.2 | 6.8 | 1.5 | |||||||||||||
| (c) Sometimes | 7.3 | 1.6 | 3.8 | 4.2 | 3.4 | 4.6 | |||||||||||||
| (d) I do not know | 5.5 | 6.5 | 4.5 | 6.3 | 5.9 | 6.2 | |||||||||||||
| What does bleeding gums mean? | |||||||||||||||||||
| (a) Healthy gums | 10.10 | 3.2 | 0.043 | 11.3 | 3.2 | 0.005 | 9.3 | 0 | 0.045 | ||||||||||
| (b) Clean gums | 16.50 | 14.5 | 11.3 | 2.1 | 7.6 | 4.6 | |||||||||||||
| (c) Gum disease | 47.7 | 37.1 | 58.6 | 70.5 | 48.3 | 61.5 | |||||||||||||
| (d) I do not know | 25.7 | 45.2 | 18.8 | 24.2 | 34.7 | 33.8 | |||||||||||||
| General health is related to oral health | |||||||||||||||||||
| (a)Yes | 56 | 51.6 | 0.505 | 51.3 | 66.3 | 0.128 | 53.4 | 55.4 | 0.099 | ||||||||||
| (b) No | 15.60 | 24.2 | 11.3 | 7.4 | 12.7 | 15.4 | |||||||||||||
| (c) Sometimes | 4.6 | 4.8 | 12.0 | 10.5 | 14.4 | 3.0 | |||||||||||||
| (d) I do not know | 23.9 | 19.4 | 25.6 | 15.8 | 19.5 | 26.2 | |||||||||||||
| When should you visit your dentist? | |||||||||||||||||||
| (a) When in pain/discomfort only | 52.3 | 43.5 | 0.318 | 68.4 | 52.6 | 0.029 | 62.7 | 61.5 | 0.210 | ||||||||||
| (b) Occasionally | 5.50 | 12.9 | 5.3 | 2.1 | 3.4 | 7.7 | |||||||||||||
| (c) Regularly every 6 months | 35.8 | 38.7 | 23.3 | 42.1 | 16.1 | 23.1 | |||||||||||||
| (d) I do not know | 6.4 | 4.8 | 2.3 | 3.2 | 16.9 | 7.7 | |||||||||||||
aChi-square test