Mandible Length

        Chervenak FA, Isaacson GC, Campbell S (eds)

         Ultrasound in Obstetrics and gynecology 1991;

Table A1-14:pg 1784 Boston: Little, Brown and Company

 

GA

(wks)

-2SD

Mean

+2SD

12

7.2

9.8

12.4

13

8.4

10.6

12.8

14

9.8

13.6

17.4

15

10.7

14.7

18.7

16

13.7

17.1

20.5

17

14.6

19.6

24.6

18

17.3

21.1

24.9

19

18.1

21.5

24.9

20

20.1

24.7

29.3

21

21.9

27.1

32.3

22

23

27.4

31.8

23

26.3

29.5

32.7

24

25.7

31.3

36.9

25

24.8

29.8

34.8

26

21.9

32.3

42.7

27

29.2

36.6

44

28

9

34

59

29

33.1

40.3

47.5

30

38

38

38

31

16.1

34.5

52.9

32

25.8

34.8

43.8

33

42

42

42

35

40

40

40