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Table 2 Kappa statistics for assessment of inter-rater reliability

From: Dental caries in 14- and 15-year-olds in New South Wales, Australia

Index No. of examiners No. of teenagers % agreement Kappa Weighted Kappa
Enamel Fluorosis/defect category * 14 55 94.4 0.89 0.90
Decayed, missing, filled or precavitated lesion category of individual teeth 14 72 95.8 0.82 NA#
Decayed, missing or filled category of individual teeth 14 72 98.8 0.92 NA
Decayed, filled or precavitated lesion category of individual surface 14 72 98.8 0.77 NA
Decayed or filled category of individual surface 14 72 99.8 0.89 NA
  1. *Teenagers were excluded if a non-fluorotic lesion was observed on the buccal surface or if a restoration or fixed orthodontic appliance was present on the labial coronal surface.
  2. #NA – not applicable. Weighted Kappa values were only calculated for fluorosis index where the categories are ordinal.