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Table 1 Caries status according to variables studied

From: Dental caries and erosion status of 12-year-old Hong Kong children

Variable (N) DMFT > 0 (n, %) p-value
Children examined (600) 21%  
Gender (600)   
   Girls (284) 73, 26% 0.004
   Boys (316) 51,16%  
Place of birth (577)   
   Hong Kong (491) 95, 19% 0.185
   Not in Hong Kong (86) 22, 26%  
Frequency of soft drinks (600)   
   At least once every two days (120) 34, 28% 0.020
   Less than once every two days (480) 90, 19%  
Frequency of citric tea/drinks containing lemon (600)   
   At least once every two days (113) 19, 17% 0.262
   Less than once every two days (487) 105, 22%  
Frequency of fruit juice (600)   
   At least once every two days (115) 27, 24% 0.408
   Less than once every two days (485) 97, 20%  
Frequency of chewing gum (600)   
   At least once every two days (70) 15, 21% 0.867
   Less than once every two days (530) 109, 21%  
Frequency of Vitamin C supplement drinks (600)   
   At least once every two days (82) 29, 35% <0.001
   Less than once every two days (518) 95, 18%  
Frequency of toothbrushing (600)   
   At least once a day (144) 34, 24% 0.317
   Twice or more (456) 90, 20%  
Care taker (598)   
   Parents (501) 109, 22% 0.162
   Others (97) 15, 16%  
Education of father (573)   
   Primary or below (61) 16, 26% 0.579
   Secondary (395) 83, 21%  
   Tertiary or above (117) 23, 20%  
Education of mother (585)   
   Primary or below (64) 15, 23% 0.848
   Secondary (434) 89, 21%  
   Tertiary or above (87) 19, 22%  
Parent’ dental knowledge (600)   
   Low (53) 9, 17% 0.534
   Middle (534) 111, 21%  
   High (13) 4, 31%  
Erosion experience (600)   
   No (150) 27, 18% 0.352
   Yes (450) 97, 22%