Chin size relative to mandibular length for a mix-sexed sample of adult modern humans from the Tigara () and El Hesa () collections housed at the American Museum of Natural History. Mandibular length (mm) represents a general biomechanical size proxy, such that if forceful mastication is important in determining corpus size, the expectation is for positive correlation between the variables. Regression is nonsignificant () indicating an absence of such a relationship. Chin size (units in mm2) is determined as a simple product of midsagittal height and chin thickness at the tuber symphyseos; that is, there is no accounting for subperiosteal bone area in these measurements. The Egyptian El Hesa sample dates between 200–400 AD; the Tigara sample derives from Point Hope, Alaska between 1200–1700 AD.
