{{ The work published in July in Nature Genetics detailed the four categories.
- Broadly affected: The smallest group — about 10 percent of participants — faced the steepest challenges, marked by developmental delays, difficulties with communication and social interaction, and repetitive behaviors that touched nearly every part of life.
- Mixed autism with developmental delay: Roughly 19 percent showed early developmental delays but few signs of anxiety, depression or disruptive behavior. Researchers call this group “mixed” because its members vary widely in how strongly they display social or repetitive behaviors.
- Moderate challenges: About a third of participants fell into this group, showing the hallmark traits of autism — social and communication differences and repetitive habits — but in subtler ways and without developmental delays.
- Social and/or behavioral: The largest group, around 37 percent, met early developmental milestones on time yet often grappled with other conditions later on, including ADHD, anxiety, depression or obsessive-compulsive disorder. }}
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