Table 2.
General interpretations of PCA and FA loadings.
| Pattern | General interpretation of loadings |
|---|---|
| PCA | |
| 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 |
| FA | |
| 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) |
See Additional file 1 for full details