The results demonstrated that the hypsarrhythmia population had significantly lower serum IGF-1 levels (34.95 ± 14.09, [range 17.20–59.00] vs. 57.15 ± 13.88, [range 34.40–79.30] ng/mL, P = 0.0071) and a significantly reduced IGF-1/IGFBP-3 ratio (12.98 ± 4.11, [range 8.56–22.96] vs. 22.27 ± 6.48, [range 14.85–32.90], P = 0.0015) compared to the non-hypsarrhythmia population (Figure 2). This evidence concerns the gene IGF1 and Hypsarrhythmia.