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Table 2 Logistic regression analysis predicting caries occurrence depending on area of residence, gender, brushing frequency, consumption of sugar-containing products and parents’ attitude in 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

Predictor B Wald OR 95 % CI p
Children of the first grade
 Area   10.528    
  Area A vs. D 0.447 1.514 1.564 0.767–3.190 0.218
  Area B vs. D 1.322 10.405 3.750 1.680–8.372 0.001
  Area C vs. D 0.576 2.555 1.779 0.878–3.603 0.110
 Gender −0.392 2.252 0.676 0.405–1.127 0.133
 Brushing frequency (times/day) 0.223 1.813 1.250 0.903–1.730 0.178
 Sugar consumption (sweets/week) 0.157 1.032 1.170 0.864 1.583
 Parents’ attitude on oral hygiene   3.916    0.141
  Not important vs. important −0.081 0.047 0.922 0.444–1.913 0.828
  Of medium importance vs. important 0.470 1.635 1.600 0.779–3.288 0.201
Children of the sixth grade
 Area      
  Area A vs. D 0.082 0.056 1.086 0.549–2.149 0.813
  Area B vs. D 1.127 9.045 3.087 1.481–6.437 0.003
  Area C vs. D −0.004 0.000 0.996 0.495–2.004 0.992
 Gender −0.236 0.833 0.790 0.476–1.310 0.361
 Brushing frequency (times/day) −0.253 2.378 0.776 0.563–1.071 0.123
 Sugar consumption (sweets/week) −0.008 0.003 0.992 0.748–1.317 0.957
 Parents’ attitude on oral hygiene   5.714    0.057
  Not important vs. important −0.036 0.010 0.965 0.470–1.982 0.922
  Of medium importance vs. important 0.603 2.957 1.828 0.919–3.634 0.086