Gestational age (weeks) | Mean (SD) | Centile | ||||||
---|---|---|---|---|---|---|---|---|
3rd | 10th | 25th | 50th | 75th | 90th | 97th | ||
Boys | ||||||||
33 | 8.96 (1.93) | 5.5 | 6.7 | 8.1 | 9.6 | 11.3 | 12.8 | 14.4 |
34 | 10.61 (2.51) | 6.0 | 7.3 | 8.7 | 10.4 | 12.1 | 13.7 | 15.4 |
35 | 11.20 (2.06) | 6.6 | 8.0 | 9.4 | 11.2 | 13.0 | 14.6 | 16.4 |
36 | 12.01 (2.80) | 7.5 | 8.9 | 10.5 | 12.3 | 14.2 | 16.0 | 17.9 |
37 | 14.45 (3.38) | 8.5 | 10.0 | 11.6 | 13.6 | 15.6 | 17.5 | 19.5 |
38 | 14.33 (2.86) | 9.2 | 10.8 | 12.4 | 14.3 | 16.3 | 18.3 | 20.3 |
39 | 15.08 (2.89) | 9.8 | 11.3 | 12.9 | 14.8 | 16.8 | 18.7 | 20.6 |
40 | 15.17 (2.77) | 10.2 | 11.7 | 13.2 | 15.0 | 17.0 | 18.8 | 20.7 |
41 | 15.33 (2.74) | 10.4 | 11.9 | 13.4 | 15.2 | 17.1 | 18.8 | 20.6 |
Girls | ||||||||
33 | 9.91 (2.39) | 5.6 | 6.8 | 8.2 | 9.9 | 11.7 | 13.4 | 15.2 |
34 | 11.23 (3.02) | 6.1 | 7.5 | 8.9 | 10.7 | 12.5 | 14.3 | 16.1 |
35 | 11.38 (2.34) | 6.7 | 8.1 | 9.6 | 11.4 | 13.3 | 15.1 | 16.9 |
36 | 12.31 (3.22) | 7.6 | 9.1 | 10.7 | 12.6 | 14.5 | 16.3 | 18.2 |
37 | 13.99 (2.89) | 8.7 | 10.2 | 11.9 | 13.9 | 15.9 | 17.8 | 19.8 |
38 | 15.18 (3.07) | 9.6 | 11.2 | 12.9 | 14.9 | 17.0 | 18.9 | 20.9 |
39 | 15.37 (2.77) | 10.3 | 11.8 | 13.4 | 15.3 | 17.3 | 19.3 | 21.3 |
40 | 15.58 (2.91) | 10.7 | 12.1 | 13.7 | 15.5 | 17.5 | 19.5 | 21.5 |
41 | 16.18 (2.99) | 11.2 | 12.6 | 14.1 | 15.9 | 17.9 | 19.9 | 22.0 |