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Table 5 Oral hygiene habits, general health, vitamin C supplements, and frequency of swimming in relation to the prevalence of dental erosion

From: The prevalence of dental erosion and associated risk factors in 12-13-year-old school children in Southern China

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