The incidence of autism is similar in boys and girls, although boys are diagnosed earlier

Autism rates in men and women may be comparable. The findings of a study conducted on a sample of 2.7 million people in Sweden over a 35 year period, and published this Thursday in the medical journal BMJ, suggest that the male to female ratio of Autism Spectrum Disorder (ASD) has decreased over time. In early childhood, before the age of 10, the male to female ratio is 3:1 (the most widely accepted ratio a few years ago was 4:1). But the numbers balance out over time. By age 20, the rate of diagnoses is practically balanced. “Findings indicate that the male to female ratio for ASD has decreased over time and with increasing age at diagnosis. This male to female ratio may therefore be substantially lower than previously thought, to the extent that, in Sweden, it may no longer be distinguishable by adulthood,” the authors conclude.

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