Indian hedgehog Protein (pg/ml) P-value Healthy children (n = 25) 0.79 ± 0. 109   Patients with autism (n = 55) 1.63 ± 0. 131 <0.001 Patients with mild to moderate autism (n = 24) 1.41 ± 0. 179   Patients with severe autism (n = 31) 1.79 ± 0. 183 <0.14

Table 1: Serum levels of Indian hedgehog protein in autistic children and their relation to the severity of autism.