Table 3 Length (in centimeters) that might be ≤ − 2 SDS according to Bertino charts based on gestational age, sex and birth order calculated based on the formula: \( \mathrm{SDS}=\frac{{\left(\frac{y}{\mathrm{M}\left(\mathrm{t}\right)}\right)}^{\mathrm{L}\left(\mathrm{t}\right)}-1}{\mathrm{S}\left(\mathrm{t}\right)\times \mathrm{L}\left(\mathrm{t}\right)} \)
Gestational age | Firstborn males | Not-firstborn males | Firstborn females | Not-firstborn females |
|---|---|---|---|---|
23 | 26.3 | 26.6 | 25.8 | 26.1 |
24 | 27.4 | 27.7 | 26.9 | 27.2 |
25 | 28.6 | 28.9 | 28.1 | 28.3 |
26 | 29.8 | 30.1 | 29.3 | 29.5 |
27 | 31.1 | 31.4 | 30.5 | 30.8 |
28 | 32.4 | 32.7 | 31.8 | 32.1 |
29 | 33.7 | 34.1 | 33.1 | 33.4 |
30 | 35.1 | 35.5 | 34.5 | 34.8 |
31 | 36.5 | 36.9 | 35.9 | 36.2 |
32 | 38.0 | 38.4 | 37.3 | 37.7 |
33 | 39.5 | 39.8 | 38.7 | 39.1 |
34 | 40.9 | 41.3 | 40.1 | 40.5 |
35 | 42.3 | 42.7 | 41.5 | 41.9 |
36 | 43.6 | 44.0 | 42.8 | 43.2 |
37 | 44.8 | 45.2 | 44.0 | 44.4 |
38 | 45.8 | 46.3 | 45.0 | 45.4 |
39 | 46.7 | 47.1 | 45.8 | 46.3 |
40 | 47.3 | 47.8 | 46.4 | 46.9 |
41 | 47.8 | 48.2 | 46.9 | 47.4 |
42 | 48.0 | 48.4 | 47.1 | 47.5 |