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Table 2 Weight (in grams) 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
23 379 397 355 373
24 408 429 381 402
25 449 472 418 441
26 501 527 466 492
27 566 597 527 557
28 647 681 602 636
29 745 784 693 732
30 861 906 803 847
31 999 1049 933 983
32 1160 1217 1085 1142
33 1345 1409 1260 1324
34 1552 1625 1457 1529
35 1779 1860 1672 1753
36 2015 2105 1896 1986
37 2244 2344 2114 2213
38 2448 2555 2306 2414
39 2606 2720 2456 2570
40 2711 2830 2555 2673
41 2767 2889 2606 2729
42 2782 2905 2619 2742