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Table 2 General interpretations of PCA and FA loadings.

From: Heritable patterns of tooth decay in the permanent dentition: principal components and factor analyses

Pattern General interpretation of loadings
   PC1 all maxillary teeth and mandibular premolars and molars
   PC2 molars vs. non-molars
   PC3 premolars vs. non-premolars
   PC4 mandibular teeth vs. maxillary teeth
   PC5 2nd molars vs. mandibular 1st molars
   PC6 mandibular premolars and 2nd molars vs. mandibular 1st molar and maxillary molars and 2nd premolar
   PC7 maxillary premolars and mandibular molars vs. maxillary molars and mandibular premolars
   PC8 complex contributions
   PC9 complex contributions
   PC10 right vs. left mandibular molars
   FAC1 posterior teeth: premolars and molars
   FAC2 maxillary anterior teeth: incisors and canines
   FAC3 mandibular canines and premolars
   FAC4 maxillary premolars
   FAC5 mandibular incisors and canines
   FAC6 non-occlusal premolar and molar surfaces, maxillary lateral incisors, and maxillary canines
   FAC7 tooth 20 (left mandibular 2nd premolar)
   FAC8 tooth 29 (right mandibular 2nd premolar)
   FAC9 maxillary 2nd molars
   FAC10 tooth 13 (left maxillary 2nd premolar)
  1. See Additional file 1 for full details