Age at autism spectrum disorder diagnosis and its association with child and family characteristics in a tertiary care hospital in Malaysia.

Doctors in Kuala Lumpur opened the charts of every child who got an autism diagnosis at their big teaching hospital. They wrote down the child’s age at that visit and any family facts parents had given.

The team wanted to know who gets diagnosed early and who waits. They did not test a treatment; they simply counted and compared.

Half of the kids were four years old or older when the doctor said “autism.” Kids with more obvious symptoms, kids who also had intellectual disability, and kids from richer families were labeled earlier.

Families who had a maid or babysitter sharing care also landed an earlier diagnosis.

Laposa et al. (2017) saw the same late-diagnosis problem in Southeast Europe, but there the median age was three-and-a-half, not four. The one-year gap shows Malaysia is moving slower, yet both regions share the same worry.

Cao et al. (2023) widens the picture. In China, toddlers whose moms left school before ninth grade were twice as likely to carry an autism label. That flips the Malaysian finding—low SES meant more diagnosis, not less. The difference is age: the Chinese study caught toddlers during routine surveys, while the Malaysian study counted kids whose parents reached a specialist. Screening toddlers finds kids; waiting for clinic visits favors the well-off.

Bhasin et al. (2007) gives an early warning from the U.S. They showed that high maternal education links only to autism without intellectual disability. Malaysia now shows the same pattern for timing: money and education speed diagnosis only when the child has no added ID.

If you assess families in Malaysia—or any place where diagnoses run late—expect four-year-olds, not two-year-olds. Push universal toddler screening so low-SES kids are not missed, and explain to highly educated parents that having a maid does not replace an early evaluation. Use the same severity check for every child; severe symptoms still slip through when families lack cash or connections.