MentalHealthDaily

Spanish Rett Syndrome Behavior Questionnaire: ICC 0.907

by GLOOM

MHD featured image for Spanish Rett Syndrome Behavior Questionnaire validation.

A 2026 Spanish Rett Syndrome Behavior Questionnaire validation preprint found strong test-retest reliability across 51 caregivers, including an intraclass correlation coefficient of 0.907 and a 31-person short-interval subset with Pearson r2 = 0.8663.1 The result supports Spanish-language research access, but it is linguistic validation rather than proof that the scale diagnoses Rett syndrome or measures …

Friedreich Ataxia MRI Study Finds 3 Progression Subtypes

by GLOOM

Photoreal illustration of brain regions affected in Friedreich ataxia with overlay of MRI imaging modalities, conveying multi-pattern subtypes.

A 2026 longitudinal MRI preprint involving 54 people with Friedreich ataxia and 57 controls found 3 biologically interpretable progression subtypes: microstructure-dominant, macrostructure-dominant, and minimal/no progression.1 The clusters make biomarker heterogeneity visible at the research level, while the classifier remains too early to assign individual patients to treatment paths. Research Highlights 3 MRI progression subtypes emerged: …