14 October 2020
: Case report 
Limitations of Dutch Growth Research Foundation Commercial Software Weight Velocity for Age Standard Deviation Score
Rare disease
Martin J.C. Van Gemert1ABCDEF*, Marianne Vlaming2ABDEF, Bülent Köseoğlu3ABCD, Cornelis M.A. Bruijninckx4ABCDE, Ton G. Van Leeuwen1ACDE, Martino H.A. Neumann5ACDEF, Pieter J.J. Sauer6ABCDEDOI: 10.12659/AJCR.925551
Am J Case Rep 2020; 21:e925551
Figure 3. Weight Velocities of the +1 SD, 0 SD and −1 SD standard weight curves for Dutch boys [5]. The weight velocity data point at t1=1.42 years was set at WV(t1)=7 kg/year. In the first example (red lines below/right), the Standard Deviation Score at age t1 was SDS(t1=1.42)=X/Y=3.5 (Eq. 2a), indicating that the weight velocity at t1=1.42 years was 3.5 Standard Deviations above the mean of the data set, the 0 SD weight velocity at age t1. In the second example (red dashed lines middle), the SDSWVA(t1,AA)=A/B=1.56 (Eq. 4a), with the weight velocity at age t1=1.42 years being 1.56 Standard Deviations above the mean of the data set, the 0 SD weight velocity at average age AA=0.805 years.