ADHD-Inattentive Type: Understanding the Overlooked Presentation

Illustration of a person with multiple thought bubbles around their head, representing the ADHD-Inattentive Type. The text reads “ADHD-Inattentive Type” with Neurodivergent Insights branding.
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As a clinical psychologist, I’ve seen firsthand how attention deficit hyperactivity disorder (ADHD) can impact individuals in unique and nuanced ways. But one subtype, in particular, often gets overlooked: inattentive ADHD. Despite being the most common subtype, it’s often dismissed as mere spaciness or a lack of interest. I want to to bring more awareness to the frequently misinterpreted inattentive subtype of ADHD and offer valuable insights into its diagnosis and management. To do so, I have gathered relevant research and designed this infographic to highlights some of the common challenges associated with this subtype.

According to Willcutt (2012), while ADHD-I is the most common subtype, people with ADHD-C are more likely to be referred for clinical services, which suggests that individuals with ADHD-I may need to take extra initiative and engage in self-advocacy to receive appropriate support and services. Here are some of the stats:

Vertical infographic titled “ADHD Inattentive Type” by Neurodivergent Insights. It highlights key traits of the inattentive subtype, including higher social anxiety, increased misdiagnosis, learning difficulties, and lower rates of stimulant prescriptions.
ADHD-Inattentive Type is often misunderstood because it’s less outwardly visible — but its impact is just as real. Recognising the subtle signs helps more people access the support they’ve always needed.

  • More likely to go undiagnosed

  • More likely to have co-occurring social anxiety (Koyuncu, 2015)

  • More likely to be female (Quinn, 2014; Weiss and Wasdell, 2003)

  • High rate of internalizing disorders (Weiss and Wasdell, 2003)

  • Higher rate of learning disabilities (Weiss and Wasdell, 2003)

  • Less likely to be treated with stimulants (Weiss and Wasdell, 2003)

  • Two to five times as likely to have a referral for speech and language problems (Weiss and Wasdell, 2003)

  • People with ADHD-I are more likely to have Sluggish Cognitive Tempo (SCT), characterized by dreaminess, mental fogginess, slow working memory, hypoactivity, staring frequently, inconsistent alertness, and excessive daydreaming. Approximately 30-63% of people with inattentive type ADHD also have SCT(Fassbender et al., 2015)

ADHD-Inattentive Type Prevalence Rates

It’s interesting to note how the prevalence of ADHD-Inattentive Type changes across different age groups. While it’s the least diagnosed subtype in preschool children, it becomes the most common subtype among adults with ADHD. This could be due to a number of factors, such as improved diagnostic methods, the development of coping strategies, and the changing demands of adult life. It’s important to keep in mind that ADHD subtypes can shift throughout a person’s lifespan, and someone who presents as inattentive at one point in time may later meet the criteria for another subtype.

Preschool: 23% of children with ADHD

Elementary School: 45% of children with ADHD 

Adolescence: 72% of teens with ADHD

Adult: 47% of people with ADHD–the most common subtype among adults 

Source: Willcutt, 2012

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References

Fassbender, C., Krafft, C. E., & Schweitzer, J. B. (2015). Differentiating SCT and inattentive symptoms in ADHD using fMRI measures of cognitive control. NeuroImage. Clinical, 8, 390–397. https://doi.org/10.1016/j.nicl.2015.05.007

Koyuncu, A., Ertekin, E., Yüksel, Ç., Aslantaş Ertekin, B., Çelebi, F., Binbay, Z., & Tükel, R. (2015). Predominantly Inattentive Type of ADHD is Associated With Social Anxiety Disorder. Journal of attention disorders, 19(10), 856–864. https://doi.org/10.1177/1087054714533193

Quinn, P. O., & Madhoo, M. (2014). A review of attention-deficit/hyperactivity disorder in women and girls: uncovering this hidden diagnosis. The primary care companion for CNS disorders, 16(3), PCC.13r01596. https://doi.org/10.4088/PCC.13r01596

Weiss, M., Worling, D., & Wasdell, M. (2003). A chart review study of the inattentive and combined types of ADHD. Journal of Attention Disorders, 7(1), 1-9.

Willcutt E. G. (2012). The prevalence of DSM-IV attention-deficit/hyperactivity disorder: a meta-analytic review. Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics, 9(3), 490–499. https://doi.org/10.1007/s13311-012-0135-8

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Dr. Megan Anna Neff
Dr. Megan Anna Neff is an AuDHD clinical psychologist. Author of Self-Care for Autistic People and The Autistic Burnout Workbook, and the forthcoming AuDHD Unlocked (Spring 2027). Founder of Neurodivergent Insights. Grounded in the blend of clinical insight, research, and lived AuDHD experience, NDI translates complex neurodivergent experiences into accessible, compassionate, and affirming resources for adults, clinicians and helping professionals worldwide.
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