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Table 2 Numbers and percentages of adolescents who have untreated dental caries (D rate) by survey year in Gangneung

From: Inequalities in oral health among adolescents in Gangneung, South Korea

D rate 201l (1st grade, 15-yr-old)
N = 1267
2013 (3rd grade, 17-yr-old)
N = 1073
Total 217(17.1)   153(14.3)  
Gender
 Girls 92(15.9)   62(12.2)  
 Boys 125(18.1)   91(16.1)  
School type
 General 94(12.3) *** 70(9.9) ***
 Vocational 123(24.6)   83(22.8)  
Father’s education
 College or above 50(10.5) *** 33(7.7) ***
 High school or below 137(19.8)   98(17.0)  
Mother’s education
 College or above 46(13.3)   31(10.3)  
 High school or below 143(17.6)   101(14.4)  
Perceived economic status
 High 145(15.6) * 99(12.6) **
 Low 72(21.4)   54(19.2)  
FAS
 High 171(15.6) *** 115(12.5) ***
 Low 46(27.4)   38(26.0)  
Frequency of tooth-brushing
 ≥2 182(16.2) * 137(14.0)  
 < 2 35(24.5)   16(17.4)  
Frequency of eating snacks
 < 1 71(15.7)   118(13.4) *
 ≥1 131(17.3)   35(18.9)  
Frequency of drinking soda
 < 1 99(15.1)   134(13.6)  
 ≥1 95(18.6)   19(21.1)  
Smoking experience
 No 124(13.8) *** 91(12.0) **
 Yes 93(25.3)   62(19.6)  
Annual visits to dental clinic
 Yes 84(14.6) * 55(10.7) **
 No 133(19.2)   98(17.6)  
  1. *p < 0.05, **p < 0.01, ***p < 0.001