title: Statistical reliability of NPI administered to a sample of sixth-grade children.
mesh_terms: D002648:Child; D003753:Dental Health Surveys; D003756:Dental Hygienists; D003773:Dental Plaque / Q000453:epidemiology*; D005069:Evaluation Studies as Topic; D006801:Humans; D008403:Mass Screening / Q000592:standards; D009911:Oral Hygiene Index