Autism has historically been considered a condition almost exclusively affecting males. Though this is no longer the case, girls are still less likely to be diagnosed with autistic conditions than boys. There are genetic reasons why there may be more autistic boys than girls. However, increasingly studies of gender and autism suggest that girls may present with different difficulties to boys. And as the current diagnostic criteria is based on the traits and behaviours of autistic males, girls with autism may not be identified. The table below identifies how the triad of impairments is often presented in girls with higher functioning autism.