This cross-sectional study (n=522 adults; median age 56 years) examined how itch-related factors — average itch intensity (AI-NRS), daily itch duration, scratching frequency, and sleep disturbance — mediate the relationship between clinician-assessed disease severity and quality of life (QoL) impairment (measured by 5PLQ) in patients with atopic dermatitis, psoriasis, chronic prurigo, or chronic urticaria, recruited across Germany between 2018 and 2020.
Disease severity correlated only weakly with QoL (r=0.201), while itch-related factors correlated strongly (r=0.515–0.603). Mediation analyses showed the severity–QoL link was partially mediated by daily itch duration (indirect β=0.270, p<0.001), sleep disturbance (indirect β=0.235, p=0.006), scratching frequency (indirect β=0.205, p=0.010), and average itch intensity (indirect β=0.168, p=0.049); peak itch intensity (WI-NRS) did not mediate significantly.
- Disease severity was harmonized into a single 0–3 scale across four conditions; CU severity used a non-validated IGA, which may reduce comparability. - Cross-sectional design prevents causal inference, only establishing mediation paths at a single time point. - Only adults were included, limiting generalizability to pediatric patients.
When managing chronic pruritic skin diseases, assess all four dimensions of itch — daily duration, sleep disruption, scratching frequency, and average (not just peak) itch intensity — as these drive QoL impairment more than skin severity scores alone. Targeting these specific itch dimensions with therapy may improve patient outcomes beyond what standard severity-based assessments capture.
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