The ratio of mandibular bone area (mm2 raised to the 0.5 power) in midsagittal section to mandibular length (mm, measured from infradentale to the intersection of the midsagittal plane with the gonion-gonion chord)) in samples of adult great apes and humans ( males and females for each taxon). 25th and 75th percentiles (box), median (line), 10th and 90th percentiles (whiskers) and outliers are shown. For this index, ANOVA is significant (), and unplanned comparisons show no difference among the apes while humans differ from each ape species at . This finding of significantly greater amount of bone given jaw length in humans applies throughout the corpus [17].
