Boys | Girls | |||||||||||
Number of observations | Centiles for head circumference (cm) | Number of observations | Centiles for head circumference (cm) | |||||||||
3rd | 10th | 50th | 90th | 97th | 3rd | 10th | 50th | 90th | 97th | |||
33 weeks | 33 | 28.25 | 29.11 | 30.88 | 32.71 | 33.62 | 17 | 27.92 | 28.76 | 30.46 | 32.24 | 33.14 |
34 weeks | 48 | 28.93 | 29.76 | 31.47 | 33.23 | 34.11 | 65 | 28.64 | 29.44 | 31.08 | 32.78 | 33.65 |
35 weeks | 127 | 29.56 | 30.37 | 32.02 | 33.73 | 34.58 | 111 | 29.28 | 30.06 | 31.64 | 33.28 | 34.12 |
36 weeks | 322 | 30.15 | 30.93 | 32.53 | 34.19 | 35.02 | 293 | 29.87 | 30.62 | 32.14 | 33.74 | 34.55 |
37 weeks | 848 | 30.69 | 31.46 | 33.02 | 34.63 | 35.43 | 798 | 30.40 | 31.13 | 32.61 | 34.15 | 34.94 |
38 weeks | 2032 | 31.21 | 31.95 | 33.47 | 35.04 | 35.83 | 1783 | 30.88 | 31.59 | 33.03 | 34.53 | 35.30 |
39 weeks | 2985 | 31.69 | 32.42 | 33.90 | 35.44 | 36.20 | 2849 | 31.32 | 32.01 | 33.41 | 34.88 | 35.62 |
40 weeks | 2532 | 32.15 | 32.86 | 34.31 | 35.81 | 36.56 | 2486 | 31.72 | 32.39 | 33.76 | 35.19 | 35.92 |
41 weeks | 1147 | 32.58 | 33.28 | 34.70 | 36.17 | 36.91 | 1180 | 32.08 | 32.74 | 34.08 | 35.48 | 36.19 |
42 weeks | 204 | 32.99 | 33.68 | 35.07 | 36.52 | 37.24 | 218 | 32.41 | 33.06 | 34.37 | 35.74 | 36.44 |
Total | 10,278 | – | – | – | – | – | 9800 | – | – | – | – | – |
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