Variables | Total No. of children | Dental erosion | Â | |
---|---|---|---|---|
 |  | No. of children | % | P |
Frequency of brushing | Â | Â | Â | Â |
   Once or less daily | 459 | 136 | 29.6 | 0.281 |
   Twice or more daily | 1040 | 280 | 26.9 |  |
Duration of brushing | Â | Â | Â | Â |
   ≤1 min | 266 | 73 | 27.4 | 0.908 |
   2 min | 702 | 192 | 27.4 |  |
   ≥3 min | 531 | 151 | 28.4 |  |
Types of toothpaste | Â | Â | Â | Â |
   Fluoride | 656 | 170 | 25.9 | 0.333 |
   Non-fluoride | 74 | 20 | 27.0 |  |
   Not sure | 769 | 226 | 29.4 |  |
Vomiting | Â | Â | Â | Â |
   Once or more monthly | 16 | 2 | 12.5 | 0.171 |
   Never/occasionally | 1483 | 414 | 27.9 |  |
Heartburn or nausea | Â | Â | Â | Â |
   Once or more monthly | 9 | 0 | - | 0.136 |
   Never/occasionally | 1490 | 416 | 27.9 |  |
Vitamin C supplements | Â | Â | Â | Â |
   Yes | 273 | 78 | 28.6 | 0.749 |
   No | 1226 | 338 | 27.6 |  |
Frequency of swimming in summer | Â | Â | Â | Â |
   Once or more weekly | 732 | 193 | 26.4 | 0.229 |
   Never/occasionally | 767 | 223 | 29.1 |  |