Table 3 Quantile estimates for neck circumference (cm) by age (years)

6

28.3 (27.3 – 29.3)

27.5 (26.2 – 28.8)

26 (24.7 – 27.3)

25.3 (24.7 – 25.9)

24.3 (23.6 – 25)

24.3 (23.4 – 25.2)

23.7 (22.5 – 24.9)

7

28 (27.4 – 28.6)

27.6 (27 – 28.2)

26.7 (25.8 – 27.5)

26.2 (25.6 – 26.8)

25.7 (25.3 – 26.1)

25.5 (25.1 – 25.9)

25 (24.4 – 25.5)

8

28.4 (28 – 28.8)

28.3 (27.8 – 28.7)

27.5 (26.7 – 28.3)

26.8 (26.3 – 27.4)

26.3 (25.8 – 26.8)

25.8 (25.4 – 26.2)

25.4 (24.9 – 25.9)

9

29.3 (28.9 – 29.7)

29.3 (28.7 – 29.9)

28.5 (27.7 – 29.3)

27.3 (26.9 – 27.8)

26.6 (25.9 – 27.2)

25.7 (25.2 – 26.3)

25.5 (24.9 – 26)

10

30.5 (30.1 – 30.9)

30.5 (29.9 – 31.1)

29.6 (28.9 – 30.3)

28 (27.6 – 28.4)

26.9 (26.1 – 27.7)

25.7 (24.8 – 26.6)

25.5 (24.8 – 26.2)

11

31.8 (31.4 – 32.2)

31.8 (31.3 – 32.3)

30.8 (30 – 31.5)

28.8 (28.4 – 29.2)

27.4 (26.6 – 28.2)

25.9 (24.9 – 27)

25.7 (24.8 – 26.7)

12

33.1 (32.7 – 33.5)

33 (32.5 – 33.6)

32 (31.2 – 32.8)

29.8 (29.3 – 30.4)

28.3 (27.5 – 29)

26.6 (25.5 – 27.8)

26.3 (25.3 – 27.3)

13

34.4 (33.8 – 35)

34.2 (33.6 – 34.8)

33.2 (32.3 – 34.1)

31.1 (30.5 – 31.7)

29.5 (28.9 – 30.1)

27.8 (26.5 – 29)

27.2 (26.2 – 28.3)

14

35.7 (34.9 – 36.5)

35.3 (34.6 – 36)

34.3 (33.3 – 35.3)

32.5 (31.8 – 33.2)

31 (30.5 – 31.5)

29.3 (27.9 – 30.7)

28.5 (27.3 – 29.7)

15

37.1 (36.3 – 37.9)

36.3 (35.6 – 37)

35.4 (34.3 – 36.4)

33.8 (33.1 – 34.5)

32.6 (32.1 – 33.1)

31 (29.5 – 32.5)

29.9 (28.7 – 31.1)

16

38.8 (37.7 – 39.8)

37.4 (36.1 – 38.6)

36.3 (35.5 – 37.1)

34.9 (34.4 – 35.4)

34 (33.5 – 34.5)

32.6 (31.3 – 33.8)

31.2 (30 – 32.4)

17

40.9 (38.1 – 43.7)

38.6 (35.7 – 41.5)

37.1 (35.5 – 38.7)

35.5 (34.3 – 36.6)

34.7 (34.2 – 35.2)

33.5 (31.9 – 35.1)

32 (29.5 – 34.5)

(b) Healthy-weight females

Age

95th

90th

75th

50th

25th

10th

5th

6

27 (26.4 – 27.6)

26.3 (25.2 – 27.4)

25.3 (24.9 – 25.7)

24.8 (24.3 – 25.3)

24 (23.7 – 24.3)

23.6 (23.1 – 24.1)

23.3 (22.3 – 24.3)

7

27.2 (26.7 – 27.7)

26.8 (26.2 – 27.4)

26.1 (25.7 – 26.5)

25.4 (25 – 25.8)

24.5 (24.2 – 24.8)

23.8 (23.2 – 24.5)

23.3 (22.7 – 24)

8

27.8 (27.2 – 28.3)

27.4 (26.9 – 27.9)

26.8 (26.4 – 27.2)

26 (25.7 – 26.4)

25.1 (24.8 – 25.5)

24.3 (23.7 – 24.9)

23.8 (23.2 – 24.4)

9

28.6 (28.1 – 29.1)

28 (27.6 – 28.4)

27.5 (27.2 – 27.8)

26.7 (26.5 – 26.9)

25.8 (25.5 – 26.1)

24.9 (24.6 – 25.2)

24.5 (24.1 – 24.9)

10

29.4 (28.9 – 29.9)

28.8 (28.4 – 29.1)

28.2 (27.9 – 28.4)

27.4 (27.1 – 27.6)

26.5 (26.2 – 26.7)

25.6 (25.3 – 26)

25.3 (24.8 – 25.7)

11

30.2 (29.7 – 30.8)

29.5 (29.2 – 29.8)

28.9 (28.6 – 29.1)

28.1 (27.7 – 28.4)

27.1 (26.8 – 27.4)

26.4 (25.8 – 27)

26 (25.4 – 26.6)

12

30.9 (30.3 – 31.5)

30.2 (29.8 – 30.6)

29.5 (29.2 – 29.8)

28.7 (28.3 – 29.1)

27.7 (27.4 – 28)

27.2 (26.5 – 27.8)

26.7 (26 – 27.3)

13

31.4 (30.7 – 32.1)

30.9 (30.5 – 31.2)

30.1 (29.7 – 30.5)

29.3 (28.9 – 29.7)

28.2 (27.9 – 28.6)

27.8 (27.3 – 28.4)

27.2 (26.6 – 27.8)

14

31.8 (31.1 – 32.5)

31.4 (31.1 – 31.7)

30.6 (30.1 – 31.1)

29.8 (29.5 – 30.1)

28.7 (28.2 – 29.1)

28.4 (27.9 – 28.9)

27.6 (27.1 – 28.1)

15

32 (31.4 – 32.6)

31.7 (31.4 – 32.1)

31 (30.4 – 31.6)

30.2 (29.9 – 30.5)

29.1 (28.5 – 29.6)

28.8 (28.2 – 29.4)

27.9 (27.5 – 28.4)

16

32.2 (31.3 – 33.1)

31.8 (31.5 – 32.1)

31.2 (30.7 – 31.7)

30.4 (30.2 – 30.6)

29.4 (28.9 – 29.9)

28.9 (28.4 – 29.5)

28.3 (27.9 – 28.7)

17

32.5 (29.9 – 35.1)

31.5 (30.8 – 32.2)

31.2 (30.9 – 31.5)

30.5 (30.1 – 30.9)

29.7 (29 – 30.4)

28.8 (28.3 – 29.3)

28.8 (28.4 – 29.2)