All diagnostic groups of referred youth, including those without full diagnoses, show processing speed below the population norm¶

Claim · All claims
Evidence · 1 study · associational r3 · q3
Currency · newest study 2020 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 2025: baselines and conditions change

Subclaims¶

q3 i? Mean PS scores of youth in every diagnostic subgroup and referred youth with no psychiatric diagnoses were significantly below the Wechsler normative mean of 100. → Braaten EB 2020

Evidence¶

Braaten EB 2020¶

Braaten EB, Ward AK, Forchelli G, Vuijk PJ, Cook NE, McGuinness P, Lee BA, Samkavitz A, Lind H, O'Keefe SM, Doyle AE. (2020). Characteristics of child psychiatric outpatients with slow processing speed and potential mechanisms of academic impact. European Child & Adolescent Psychiatry. https://doi.org/10.1007/s00787-019-01455-w

q3 · i? · associational · r3

One-sample t-tests (Table 2) compared each diagnostic group's mean PS Index with the population mean of 100. Even referred youth with no full psychiatric diagnosis scored below norms (M = 97.2, p = .02); psychosis showed the lowest mean (M = 84.5, p < .0001).

"the mean PS score of youth in all of the diagnostic subgroups, as well as in the referred youth with no psychiatric diagnoses, was significantly below the Wechsler normative mean of 100."

Discussion¶

Related Claims¶

• Inattention is the only psychopathology symptom dimension associated with slow processing speed, and it does not explain the associations with ASD or psychosis — related
• Psychosis, ASD, and ADHD-Inattentive Type independently elevate risk for slow processing speed relative to referred youth without diagnoses — related
• Having three or more comorbid psychiatric conditions increases risk for slow processing speed, but a single comorbid condition does not — related
• Processing speed is the most impaired Wechsler cognitive domain among youth referred for neuropsychiatric evaluation — related