Table 5 Percentile reference values of head circumference (in cm) for Chinese newborn infants aged 24–42 weeks.

24

19.4

20.3

21.2

22.0

22.8

23.5

24.0

19.3

20.0

20.7

21.6

22.3

22.8

23.2

25

20.3

21.3

22.2

23.1

23.9

24.6

25.2

20.1

20.9

21.7

22.6

23.3

23.9

24.4

26

21.2

22.2

23.2

24.1

25.0

25.7

26.4

20.9

21.8

22.6

23.6

24.4

25.0

25.6

27

22.1

23.2

24.1

25.1

26.0

26.8

27.5

21.7

22.7

23.6

24.5

25.4

26.1

26.7

28

23.0

24.1

25.1

26.1

27.0

27.8

28.6

22.6

23.5

24.5

25.5

26.5

27.2

27.9

29

23.9

25.0

26.0

27.0

28.0

28.9

29.7

23.4

24.4

25.4

26.5

27.5

28.3

29.0

30

24.7

25.8

26.9

28.0

29.0

29.9

30.7

24.2

25.2

26.3

27.4

28.5

29.3

30.1

31

25.6

26.7

27.7

28.8

29.9

30.8

31.7

25.0

26.1

27.2

28.3

29.4

30.3

31.1

32

26.4

27.5

28.6

29.7

30.7

31.7

32.6

25.9

27.0

28.1

29.2

30.3

31.2

32.1

33

27.3

28.4

29.4

30.5

31.5

32.5

33.4

26.8

27.9

28.9

30.1

31.1

32.1

33.0

34

28.1

29.2

30.2

31.3

32.3

33.2

34.2

27.7

28.7

29.7

30.8

31.9

32.8

33.7

35

28.9

30.0

30.9

31.9

32.9

33.9

34.8

28.5

29.5

30.5

31.5

32.6

33.5

34.4

36

29.7

30.6

31.6

32.5

33.5

34.4

35.3

29.3

30.2

31.2

32.2

33.1

34.0

34.9

37

30.3

31.2

32.1

33.1

34.0

34.9

35.8

30.0

30.9

31.8

32.7

33.6

34.5

35.3

38

30.9

31.8

32.6

33.5

34.4

35.3

36.1

30.5

31.4

32.3

33.1

34.0

34.8

35.7

39

31.3

32.2

33.0

33.9

34.7

35.6

36.5

31.0

31.9

32.7

33.5

34.3

35.2

36.0

40

31.6

32.5

33.3

34.1

35.0

35.8

36.7

31.4

32.2

33.0

33.8

34.6

35.4

36.3

41

31.9

32.8

33.6

34.4

35.2

36.0

36.9

31.7

32.5

33.3

34.1

34.9

35.7

36.6

42

32.2

33.0

33.8

34.6

35.4

36.2

37.1

31.9

32.8

33.6

34.3

35.2

36.0

36.9