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Table 1 Values of dmft/DMFT, dental caries prevalence and prevalence ratios (area D used as control) of children with primary and permanent dentition

From: Caries prevalence and manganese and iron levels of drinking water in school children living in a rural/semi-urban region of North-Eastern Greece

  Children with primary dentition (1st grade of elementary school) Children with permanent dentition (6th grade of elementary school)
dmft (mean ± SD) DMFT (mean ± SD)
Total 2.3 ± 2.6 3.3 ± 3.6
Area A 3.2 ± 3.7 2.0 ± 2.4
Area B 4.5 ± 3.9 2.9 ± 2.2
Area C 3.0 ± 3.4 2.0 ± 2.6
Area D 2.3 ± 2.9 2.3 ± 2.7
p 0.004 0.138
  Children with primary dentition (1st grade of elementary school) Children with permanent dentition (6th grade of elementary school)
dmft >0 [n (%)] DMFT >0 [n (%)]
Total 188 (64.2 %) 170 (60.7 %)
Area A 48 (63.2 %) 36 (54.5 %)
Area B 56 (80 %) 59 (78.7 %)
Area C 50 (53.3 %) 31 (53.4 %)
Area D 34 (53.1 %) 44 (54.3 %)
p 0.011 0.003
  Children with primary dentition (1st grade of elementary school) Children with permanent dentition (6th grade of elementary school)
Prevalence ratio vs. Area D (95 % CIs) Prevalence ratio vs. Area D (95 % CIs)
Area A 1.19 (0.892–1.584) 1.00 (0.75–1.35)
Area B 1.51 (1.16–1.95) 1.45 (1.15–1.83)
Area C 1.13 (0.85–1.51) 0.98 (0.72–1.34)
  1. Area A High Mn–high Fe area, Area B High Mn–low Fe area, Area C Low Mn–high Fe area, Area D Low Mn–low Fe area