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Mean number of teeth per child missing due to dental caries (decay) in the whole age-group, i.e. teeth which decayed in the past and were treated by extraction.

Mean number of filled otherwise sound teeth per child in the whole age-group, i.e. teeth which decayed in the past, and were treated by filling, and which do not currently require further treatment.

Mean number of teeth per child in the whole age-group which are either actively decayed and require treatment or which were treated for decay either by extraction or filling, i.e. the mean number of teeth which were affected by decay. This is a summation of the mean number of decayed/missing/filled ...