Measuring atopic eczema severity visually: which variables are most important to patients?

BACKGROUND: There is wide variation in the objective visual variables used to measure atopic eczema severity in clinical trials, making comparison and interpretation of results difficult.
OBJECTIVE: To provide a rationale for simplifying and standardizing objective atopic eczema scoring by investigating which visual variables provide the best measure of disease severity from the patient's perspective.
SETTING: The dermatology outpatient department at the Queen's Medical Centre, University Hospital in Nottingham, and 5 local general practices. PATIENTS: One hundred eighty individuals with atopic eczema.
INTERVENTIONS: Clinical examination with scoring of 7 clinical signs and disease extent, followed by regression analyses of visual variable scores against a patient-rated measure of current disease severity.
RESULTS: Objective measurements account for only a quarter of the variation in patient-rated disease severity. Three clinical signs were independent predictors of patient-rated disease severity: excoriations, erythema, and edema/papulation. Disease extent measurements do not reflect patient-rated disease severity in a linear manner, with mean severity scores increasing little above 30% body surface area involvement.
CONCLUSIONS: From the patient's perspective, the measurement of 3 clinical signs-excoriations, erythema, and edema/papulation-provides as much information about current atopic eczema severity as more complex scoring systems that measure multiple clinical signs and disease extent. The simplicity of the Three Item Severity score, a previously published atopic eczema score based on measurement of these 3 clinical signs, makes it a suitable tool for research studies or clinical practice.