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A heritability estimate of 0.53 was previously reported for nose width in a pedigree analysis of 229 Korean individuals29.
A previously mentioned study reported its highest heritability estimates of 0.42, 0.44, 0.53 and 0.61 for mandible width, nasal protrusion, nose width and inner eye corner distance respectively29.
A number of facial lengths, including bizygomatic and nose width, had heritability estimates close to or greater than 0.7, values that are significantly higher than the ones previously encountered in the respective literature.
Nose width was also reported to be moderately to highly heritable in two studies of 125 Belgian and 342 Indian families with corresponding estimates of 0.639 and 0.49812,32.
Here, the nose width EDT and biocular width GDT yielded two of the three highest estimates −0.718 and 0.789 respectively-, while nasal protrusion and eye distance EDTs and GDTs were moderately to highly heritable, with heritability estimates ranging from 0.505 to 0.677.
A statistical comparison of facial traits of European Americans and African Americans – forehead-chin distance, ear height, nose width and distance between pupils, for example – with other body traits – forearm length, height at waist, etc. – showed that facial traits are, on average, more varied than the others.
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Of these, estimates greater than 0.7 were acquired for the two upper/middle face EDTs, zygomatic and nose widths, while the heritabilities of the mandible and mouth widths were found to be slightly lower at approximately 0.62 and 0.67, respectively.
Due to the small number of lip and nose widths measured in our study, these were not compared between studies (see Table 3*).
South Indians had the broadest nose (nasal width = 38.66 mm), whereas subjects from the Himalayan region had the shortest nose (nasal height = 47.2 mm).
The last of searched characteristic points are about the nose's width in its widest place.
Facial anatomical structures such as dimensions of the external nose, nasal width, and nostril diameters and difference in nasal mucosal blood flow could be contributing factors although it requires further studies [ 18, 21].
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