> there is a 3-to-1 male-to-female ratio in autism prevalence
There is a 3-to-1 ratio in diagnostic prevalence. From the article you linked: "There appears to be a diagnostic gender bias, meaning that girls who meet criteria for ASD are at disproportionate risk of not receiving a clinical diagnosis."
There is a 3-to-1 ratio in diagnostic prevalence. From the article you linked: "There appears to be a diagnostic gender bias, meaning that girls who meet criteria for ASD are at disproportionate risk of not receiving a clinical diagnosis."
There are multiple theories for this difference: genetics, environment, ...; but also gender bias in diagnosis. eg. https://www.theguardian.com/society/2018/sep/14/thousands-of...