Autism spectrum disorder (ASD) in girls is diagnosed at a later stage than boys as girls exhibit less severe symptoms. Females also have different symptoms than males, possibly contributing to later identification of the disease, it added.
"This suggests that girls with ASD, as well as perhaps older women with this disorder, differ from males in key symptoms and behaviors, particularly around social interactions," said Paul Lipkin, Director of the interactive autism network, Kennedy Krieger Institute, Maryland.
For the study, the researchers analysed data from an online registry that includes almost 50,000 individuals and family members affected by ASD. In the data review, researchers found that girls were diagnosed with pervasive developmental disorder, an ASD impacting the development of many basic skills, at a mean age of four years compared to 3.8 years for boys.
Older boys, ages 10-15, also had more difficulties with the ability to recognize social cues and use language in social situations.