Inter‐observer agreement on acne severity based on facial photographs
2010
Background The three-grade acne classification (mild, moderate, severe) is widely used to define the licensed indications of acne treatments, and for therapeutic decision-making in clinical practice, but its reproducibility has never been assessed.
Methods Ten photographs of facial acne were scored independently by eight experts using the three-grade acne classification. We conducted a descriptive analysis of the results, based on graphical representation of the scores for each photograph.
Results Inter-observer agreement on acne severity based on the three-grade acne classification was very poor.
Conclusion The classical three-grade acne classification is poorly reproducible. A new rating tool accompanied by a clinical description of each severity level would be extremely useful.
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