Why are girls diagnosed with ADHD and ASD later than boys?

06 Jul 20213-minute read
Parents, Schools, Healthcare
Why are girls diagnosed with ADHD and ASD later than boys?

While awareness of attention deficit hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) has received a much-needed boost in recent years, a lingering stereotype remains — that ADHD and ASD are more commonly ‘male’ conditions, particularly among children.

Indeed, in Australia, more than twice as many boys aged under 14 are diagnosed with ADHD compared to girls of the same age (5.8% vs. 2.3% of the population).1 Similarly, boys are four times more likely than girls to be diagnosed with ASD (1.1% vs. 0.3%).2,3 However, these statistics are far from the whole story.

Most of what we know about ADHD and ASD has been learned through observation of boys. But research is increasingly showing girls experience and show associated difficulties differently.4,5 Consequently, there is a higher percentage of girls that go undiagnosed for ADHD and ASD — sometimes for their entire lives.

“There are a number of things contributing to a perfect storm of under-diagnosed girls and women,” explains Dr Simone Gindidis, Developmental Psychologist and Clinical Lead at TALi, referring to ADHD specifically. “ADHD has a gendered image problem, which contributes to it not being well understood.”

For most people, when they think about a child experiencing attention issues they are mostly aware of things like difficulty focusing, sustaining attention, planning and completing work — which all kids can experience. For some reason though, when people think of ADHD, they think of disruptive behaviours that are largely associated with the impulsive and ‘hyperactive’ actions of boys.

“There are proportionally less girls with ADHD who fit this stereotype as girls tend to present with less disruptive or overt symptoms,” continues Simone. “These symptoms are categorised as ‘inattentive’, so their struggles can be easily missed by educators and general practitioners.”

Tom Osborn, Clinical Psychologist and Director of Chology believes a similar situation is occurring with girls and ASD: “It is usually females living with high-functioning ASD who fly under the radar or are ‘missed’,” he admits. “Girls with more severe cases of ASD are generally noticed earlier on in their development and granted the appropriate supports.” 

Just as Simone notes for ADHD in girls, Tom acknowledges that there is a lack of awareness about the female presentation of ASD – both at a community level and among healthcare professionals – which can be quite distinct to a ‘typical’ male on the spectrum.

“Correctly identifying females with ASD can be very challenging based on a brief interaction with the individual,” adds Tom. “A gold-standard diagnostic assessment of ASD involves three to five or more hours of evaluation before a determination is made. We shouldn’t expect healthcare professionals to make a quick judgement call in these cases. Though, unfortunately, these premature conclusions are being made and often result in a missed diagnosis.” 

Tom also attributes high assessment costs, long waitlists and a lack of local services as being likely contributors to this issue.

Simone suggests that increasing familiarity with how symptoms of neurodevelopmental disorders such as ADHD and ASD commonly present in girls and women will help general practitioners with offering timely referrals for comprehensive assessments and support from professionals like psychologists and paediatricians, including those with advanced training in the area such as Educational and Developmental psychologists. However, she also acknowledges that general practitioners operating at the coalface of public health are often under-resourced and may easily miss symptoms even with further training.

For all children with ADHD and ASD, early intervention is key to supporting them throughout the school years, when they are developing essential literacy and numeracy skills, and forming important peer relationships. But parents, families and teachers can also be on the lookout for these subtle gender differences to help give girls the best possible opportunity to learn and thrive.

This is an expanded version of the expert comments provided by TALi’s Dr Simone Gindidis and Chology’s Tom Osborn in an article published in Melbourne’s Herald Sun.

The article forms part of TALi’s Focus on Girls series.


If this article has raised any questions, please consider reaching out to one of the below organisations for information and support:

Amaze — Shaping the future for autism

Yellow Ladybugs

Australian Psychological Society (APS) | Find a Psychologist™

Raising Children Network 


Further reading

1. Deloitte Access Economics. The social and economic costs of ADHD in Australia. Report prepared for the Australian ADHD Professionals Association, July 2019 (accessed Jun 2021).

2. Australian Bureau of Statistics. Autism in Australia. Disability, Ageing and Carers, Australia: Summary of Findings, 2015 (accessed Jun 2021).

3. Autism Awareness Australia [website]. Autism and girls (accessed Jun 2021).

4. Mowlem F, Agnew-Blais J, Taylor E, et al. Do different factors influence whether girls versus boys meet ADHD diagnostic criteria? Sex differences among children with high ADHD symptoms. Psychiatry Res 2019; 272: 765-773.

5. Nussbaum NL. ADHD and Female Specific Concerns: A Review of the Literature and Clinical Implications. J Atten Disord 2012; 16: 87-100.