IGF1 and autism: Although our study did not reveal a statistically significant correlation between IGF-1 and age in the control group analyzed separately (Spearman’s correlation rs = 0.207, p = 0.282, n = 29), the correlation with age was maintained in the autism group (Spearman’s correlation rs = 0.429, p = 0.046, n = 22, Fig. 3b).