For every girl(s) diagnosed with autistic disorder, about boys are diagnosed.

The ratio between boys and girls who are diagnosed with Autism is closer to three boys for every two girls. 1 out of 42 boys and 1 out of 189 girls. Boys outnumber girls with autism by 4 to, therefore, it is more common to boys. So, here is the answer. For every 2 girls diagnosed with with autistic disorder, about 3 boys are diagnosed. Hope this answer helps.