The Interaction Effect of the Selected MPAs Variables for Discriminating EOS and AOS. (A) overall interaction, (B) two-way interaction (length of the philtrum with the other variables), (C) two-way interaction (interpupillary distance with the other variables), (D) two-way interaction (tragion to subnasale with the other variables), (E) two-way interaction (length of lower mouth with the other variables), (F) two-way interaction (facial width with the other variables), (G) two-way interaction (high palate with the other variables). Abbreviations: CT, curved toenail; FW, facial width; HP, high palate; ID, interpupillary distance; LLM, length of lower mouth; LP, length of the philtrum; TS, tragion to subnasale.