Classificatory reliability of the Carabelli trait in man.

Classificatory reliability of the Carabelli trait was evaluated using randomly-selected study models and 52 unbiased observers. Benzécri's correspondence analysis showed Dahlberg's classification to be the most confidently applied. Observers showed less confidence in the application of individual class boundaries described by Goose and Lee; the methods of Alvesalo and Shapiro were the least confidently applied. Pair-wise Yates' chi-square tests on differences in left and right counts for each of the above methods indicated a significantly higher degree of antimeric classificatory consistency for the Dahlberg method.