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

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

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

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