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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: \( \mathrm{SDS}=\frac{{\left(\frac{y}{\mathrm{M}\left(\mathrm{t}\right)}\right)}^{\mathrm{L}\left(\mathrm{t}\right)}-1}{\mathrm{S}\left(\mathrm{t}\right)\times \mathrm{L}\left(\mathrm{t}\right)} \)

From: Practical tools to identify short children born small-for-gestational-age eligible for rhGH treatment according to Italian regulation

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