
The validated Investigator Global Assessment for Atopic Dermatitis (vIGA‐AD™) is a standardised severity assessment used in clinical trials and registries for atopic dermatitis (AD). This study investigates the reliability, validity, responsiveness, and within‐patient meaningful change of the vIGA‐AD. Data were analysed from adult patients with moderate‐to‐severe AD in the BREEZE‐AD1 (N=624 patients; NCT03334396), BREEZE‐AD2 (N=615; NCT03334422), and BREEZE‐AD5 (N=440; NCT03435081) phase 3 baricitinib clinical studies. Moderate‐to‐large correlations between vIGA‐AD and EASI or body surface area (range at baseline, 0.497–0.736; Week 16, 0.716–0.893) supported convergent validity. Anchor and distribution‐based methods supported a vIGA‐AD change of ‐1.0 as clinically meaningful. The vIGA‐AD demonstrated sufficient reliability, validity, responsiveness, and interpretation standards in clinical trials.
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