The calculator in question is the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, 5th Edition) diagnostic criteria for ADHD (Attention-Deficit/Hyperactivity Disorder) in children, specifically the inattentive subtype. This calculator is used by clinicians to diagnose ADHD in children and adolescents, with a focus on those who predominantly exhibit inattentive symptoms. 

The DSM-5 criteria for ADHD, inattentive subtype, require the presence of at least six specific symptoms of inattention for children up to age 16, or five for adolescents 17 and older and adults. Symptoms must be present for at least 6 months, and they must be inappropriate for the individual's developmental level. 

The clinical utility of this calculator is to provide a standardized, evidence-based tool for diagnosing ADHD in children and adolescents. It helps clinicians to accurately identify the disorder, which is crucial for determining appropriate treatment and management strategies. 

Exclusion criteria for the use of this calculator include symptoms that are better explained by another mental disorder, symptoms that do not cause clinically significant distress or impairment in social, educational, or occupational functioning, and symptoms that are not present prior to age 12.

DSM-5 diagnostic criteria for ADHD in children, inattentive subtype

# Criteria
 # Inattention
A. Often fails to give close attention to details or makes careless mistakes in schoolwork, at work, or with other activities (+1)
B. Often has trouble holding attention on tasks or play activities (+1)
C. Often does not seem to listen when spoken to directly (+1)
D. Often does not follow through on instructions and fails to finish schoolwork, chores, or duties in the workplace (e.g., loses focus, side-tracked) (+1)
E. Often has trouble organizing tasks and activities.
F. Often avoids, dislikes, or is reluctant to do tasks that require mental effort over a long period of time (such as schoolwork or homework) (+1)
G. Often loses things necessary for tasks and activities (such as school materials, pencils, books, tools, wallets, keys, paperwork, eyeglasses, mobile telephones) (+1)
H. Is often easily distracted (+1)
I. Is often forgetful in daily activities. (+1)
# Course of disease
J. Presence of symptoms for at least 6 months, to the extent that is disruptive and inappropriate for the person's developmental level (+100)

# Conditions
- score >= 106
- true
- score == 0

Do the diagnostic criteria for ADHD need to change? Comments on the preliminary proposals of the DSM-5 ADHD and Disruptive Behavior Disorders Committee.