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Table 3 Mean dmft scores of the surveyed children according to parental dental knowledge and socio-economic status

From: Oral health status and behaviours of preschool children in Hong Kong

Independent variable Group No. (%) dmft ± S.D. Sig. Bonferroni Comparison
Parental dental knowledge Score 0-7a 69 (10%) 3.0 ± 4.2 p < 0.01 a, b > c
Score 8-14b 358 (51%) 2.7 ± 3.8   
Score 15-21c 273 (39%) 1.4 ± 2.6   
Family income (HKD) ≤ 10000 a 234 (33%) 2.8 ± 4.0 p < 0.01 a, b > c
10000 – 20000 b 241 (34%) 2.6 ± 3.6   
≥ 20000 c 225 (32%) 1.2 ± 2.5   
Father’s education level Primary or below a 93 (14%) 2.7 ± 4.1 p < 0.01 a, b > c
Secondary b 477 (69%) 2.4 ± 3.6   
Tertiary or above c 136 (20%) 1.1 ± 2.1   
Mother’s education level Primary or below a 125 (18%) 2.9 ± 4.1 p < 0.01 a > c
Secondary b 477 (69%) 2.2 ± 3.4   
Tertiary or above c 92 (13%) 1.3 ± 2.6   
Parenthood Single 31 (4%) 3.8 ± 4.6 p = 0.01  
Double 669 (96%) 2.1 ± 3.4   
Care taker Parents a 469 (67%) 2.2 ± 3.5 p < 0.01 a, b, d > c
Grandparents b 112 (16%) 3.0 ± 4.1   
Domestic helpers c 105 (15%) 1.2 ± 2.2   
Others d 14 (2%) 3.2 ± 3.7