===============+============+============+============ Age groups | 1 | 2 | 3 ---------------+------------+------------+------------ Number | | | examined | 4 | 13 | 33 | | | Occipitonasal | 20.5 | 21.2 | 22.0 length | 20.0 21.2 | 20.8 21.8 | 21.5 23.2 | | | Mastoid | 9.8 | 10.04 | 10.12 breadth | 9.7 10.0 | 9.6 10.4 | 9.5 10.5 | | | Length of | 8.07 | 9.02 | 9.07 zygomatic arch | 8.0 8.2 | 8.5 9.3 | 8.5 9.4 | | | Breadth of | 3.36 | 3.33 | 3.37 palate at P4 | 3.3 3.5 | 3.1 3.4 | 3.1 3.8 | | | Breadth of | 2.4 | 2.55 | 2.66 palate at M3 | 2.3 2.6 | 2.3 2.7 | 2.3 3.2 | | | Palatal | 8.67 | 8.98 | 9.38 length | 8.4 9.1 | 8.8 9.2 | 9.3 9.8 | | | Distance from | | | incisors to | 8.53 | 8.98 | 9.08 postpalatal | 8.4 8.7 | 8.5 9.5 | 9.0 9.8 notch | | | | | | Interorbital | 4.25 | 4.19 | 4.2 breadth | 4.2 4.3 | 4.0 4.4 | 4.0 4.4 | | | Average length | | | of upper | 3.2 | 3.2 | 3.21 molar series | 3.2 3.4 | 3.2 3.4 | 2.9 3.5 | | | Breadth of | 9.5 | 9.58 | 9.61 braincase | 9.3 9.7 | 9.2 9.7 | 9.1 10.0 | | | Zygomatic | 10.33 | 10.49 | 10.55 breadth | 10.0 10.7 | 10.4 10.9 | 10.1 11.2 | | | Condylobasal | 16.9 | 18.33 | 18.80 length | 16.6 17.1 | 17.4 19.2 | 18.2 19.5 ---------------+------------+------------+------------