Height reference data derived from Mlakar M, Gradisek A, Lustrek M, Jurak G, Soric M, Leskosek B, Starc G (2023). Adult height prediction using the growth curve comparison method. PLOS ONE 18(2): e0281960. https://doi.org/10.1371/journal.pone.0281960 Source: https://repo.ijs.si/mihamlakar/height-forecasting ; revision aa3f8dee42e775a1f32950a0bd335c49a7da7bb9. Only age-8-to-18 height values are included, converted from mm to cm, with invalid/incomplete rows excluded. No child IDs, weights, or fitness measurements are included. Independently implemented experimental growth-rate comparison, used as a capped adjustment to the original formula and hypothetical timing. Not an exact reproduction of GCC or an endorsement by the researchers. Reference outcomes end at 18, not necessarily final adult height. The combined method has not been validated.