Abstract
Background
Eczema affects ~20% of children but multiple different outcome measures have hampered research into the effectiveness of different treatments.
Objectives
To compare the change in scores and correlations within and between five measures of eczema severity: Patient Orientated Eczema Measure (POEM), Eczema Area Severity Index (EASI), Six Area Six Sign Atopic Dermatitis (SASSAD), Three Item Severity (TIS), and skin hydration (corneometry).
Methods
Data from a feasibility trial that randomised young children with eczema to one of four emollients were used. Participants were followed for three months (84 days). Descriptive statistics (by emollient over time) and Spearman's correlation coefficients comparing scores at each time-point and absolute change (between adjacent time-points) for each outcome measure were calculated.
Results
197 children, mean age (SD) of 21.7 (12.8) months, were randomised. POEM and TIS appeared to capture a range of eczema severity at baseline but only POEM had close approximation to normal distribution. Mean POEM, EASI, SASSAD and TIS scores improved month-by-month, with POEM showing the greatest sensitivity (effect size 0.42). Correlations within POEM, EASI, SASSAD and TIS were moderate-to-good, decreasing over time. Correlations between measures were strongest for EASI, SASSAD and TIS. By contrast, corneometry scores were more variable, correlated less well over time, and were poorly correlated with the other measures.
Conclusions
Except for corneometry, all measures appear to change in relation to emollient use over time and correlate well with themselves. POEM demonstrated the greatest range of scores at baseline and change in eczema severity over the first 28 days.
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