LEP and developmental disability: Using a sample of 169 children between 2 and 15 years of age from a cohort stratified as follows: 37 children with early-onset ASD (87% male); 33 children with regressive ASD (86% male); 50 TD children (76% male); 26 siblings of children with ASD (77% male); and 23 children with developmental disabilities (DD), this study found that children diagnosed with ASD had significantly higher plasma levels of leptin compared to the TD controls, DD, and siblings of children with ASD.