Patterns and Stability of Repetitive and Restricted Behaviors in Chinese Children With Autism: A 1-3 Year Follow-Up Study.
Autistic girls display milder repetitive behaviors that change more over time, so plan annual re-screenings and lower your threshold for follow-up.
01Research in Context
What this study did
Yanting and colleagues tracked the same group of Chinese autistic children for one to three years.
They measured how severe each child's repetitive and restricted behaviors (RRBs) were at two time points.
Then they compared boys and girls to see whose symptoms stayed the same and whose changed.
What they found
Boys started out with stronger RRBs than girls.
Over the next few years the boys' scores stayed fairly steady, while the girls' scores moved up and down more.
In short: girls began milder and their pattern was less predictable.
How this fits with other research
Mandy et al. (2012) saw the same "boys tougher, girls milder" snapshot in a large cross-sectional sample. The new study adds the missing piece: the milder starting point in girls is not just a one-time view—it holds across years.
Hodge et al. (2025) found Australian girls were referred for assessment six months later than boys, matching the Chinese data that girls present fewer obvious RRBs. Together the papers warn that quieter RRBs can delay identification.
Ivy et al. (2017) showed that standard autism rating scales work the same way for both sexes. Because the tools are fair, the sex gap the Chinese team reports is real biology, not a testing glitch.
Why it matters
When you assess an autistic girl, expect subtler repetitive play or interests. Re-check her yearly; her profile may shift more than a boy's. Document small changes so teams do not miss growing needs and families do not blame themselves for "new" behaviors that were simply brewing slowly.
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02At a glance
03Original abstract
Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by significant clinical heterogeneity. Sex-based differences are observed in the core symptoms of ASD. This study investigated the patterns and stability of restricted and repetitive behaviors (RRBs) among Chinese children with ASD. For cross-sectional comparisons, researchers recruited 1760 male and 350 female participants whose ages ranged from 4 to 17 years. The Social Responsiveness Scale-2 (SRS-2) was used to measure the core symptoms of ASD. Compared with males, females exhibited lower severity and incidence rates of RRB both overall and at the symptom level. Furthermore, multigroup confirmatory factor analyses demonstrated that sex-related differences did not significantly affect the conceptualization of RRBs. An online follow-up study involving a subset of participants (166 males and 41 females) revealed that RRB symptoms remained stable between the two visits for males; however, only specific symptoms were highly consistent over time for females. This study revealed potential sex-related differences in RRBs among Chinese individuals with ASD and revealed sex-dependent variations in symptom-level presentation patterns and stability. These findings may contribute to a better understanding of the mechanisms underlying sex-related differences and aid in the development of sex-specific diagnostic criteria.
Autism research : official journal of the International Society for Autism Research, 2025 · doi:10.1002/aur.70130