Perinatal and Obstetric Predictors for Autism Spectrum Disorder.
Kids with autism plus ADHD or ID carry distinct prenatal risk stories, so we should stop treating all autism cases as one big group.
01Research in Context
What this study did
Perales-Marín et al. (2021) looked at insurance claims for 1.2 million U.S. births. They split kids with autism into three groups: autism only, autism plus ADHD, autism plus intellectual disability.
They then hunted for pregnancy and birth events that showed up in the medical codes. They asked, 'Do the three groups have different prenatal risk patterns?'
What they found
Each group had its own fingerprint of prenatal risks. Autism-plus-ADHD cases were linked to late-term bleeding and C-section. Autism-plus-ID cases were linked to very early birth and low birth weight.
The autism-only group had the fewest birth complications. The authors say this supports treating these clusters as separate sub-types when we study causes.
How this fits with other research
Sparaci et al. (2015) saw the same split using Finnish registries. Kids with both autism and ID had more congenital eye, brain, and face anomalies—problems that start in the first three months of pregnancy. The U.S. and Finnish data line up: the autism-plus-ID pattern starts early and shows up in both body and brain.
Taylor et al. (2017) found that moms who reported two or more major stress events during pregnancy had children with worse autism social scores. Alfredo’s work extends this by showing stress-related risks are not one-size-fits-all; they cluster mainly in the autism-plus-ADHD group.
Lancioni et al. (2008) linked high blood pressure during pregnancy to slightly higher autism severity scores. Alfredo’s data now show that hypertension tracks more with the autism-plus-ADHD subgroup, giving a clearer target for future studies.
Why it matters
If you assess a child with autism, note the co-occurring conditions. The birth history gives different clues depending on the mix: ADHD flags late-pregnancy events; ID flags early delivery and low weight. Share these patterns with pediatricians to guide medical follow-up and, when relevant, family planning discussions.
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02At a glance
03Original abstract
Previous work identified three subgroups of children with ASD based upon co-occurring conditions (COCs) diagnosed during the first 5 years of life. This work examines prenatal risk factors, given by maternal medical claims, for each of the three subgroups: children with a High-Prevalence of COCs, children with mainly developmental delay and seizures (DD/Seizure COCs), and children with a Low-Prevalence of COCs. While some risk factors are shared by all three subgroups, the majority of the factors identified for each subgroup were unique; infections, anti-inflammatory and other complex medications were associated with the High-Prevalence COCs group; immune deregulatory conditions such as asthma and joint disorders were associated with the DD/Seizure COCs group; and overall pregnancy complications were associated with the Low-Prevalence COCs group. Thus, we have found that the previously identified subgroups of children with ASD have distinct associated prenatal risk factors. As such, this work supports subgrouping children with ASD based upon COCs, which may provide a framework for elucidating some of the heterogeneity associated with ASD.
Journal of autism and developmental disorders, 2021 · doi:10.1007/s10803-010-0992-0