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Related Experiment Video

Updated: Jun 8, 2026

Modeling the Functional Network for Spatial Navigation in the Human Brain

Modeling the Functional Network for Spatial Navigation in the Human Brain

Published on: October 13, 2023

Reliability of hamilton-norwood classification.

M Guarrera¹, P Cardo, P Arrigo

¹Department of Endocrinological and Medical Sciences, Section of Dermatology, Genoa, Italy.

International Journal of Trichology

|October 8, 2010

Summary

This summary is machine-generated.

The Hamilton-Norwood scale (HNS) for assessing male pattern baldness shows poor reliability among dermatologists and residents. This suggests the scale needs revision for more consistent clinical use in androgenetic alopecia (AGA) studies.

Keywords:

Alopecia Hamilton baldness hair

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Last Updated: Jun 8, 2026

Modeling the Functional Network for Spatial Navigation in the Human Brain

Modeling the Functional Network for Spatial Navigation in the Human Brain

Published on: October 13, 2023

Area of Science:

Dermatology
Trichology
Clinical Assessment Scales

Background:

The Hamilton-Norwood scale (HNS) is widely used to evaluate androgenetic alopecia (AGA) severity.
HNS is crucial for clinical trials and studies linking AGA to conditions like heart disease and prostate cancer.

Purpose of the Study:

To assess the reproducibility of the Hamilton-Norwood scale (HNS) when used by dermatologists and dermatology residents.
Evaluate inter-rater and intra-rater reliability of the HNS in classifying AGA severity.

Main Methods:

Two studies were conducted involving dermatologists and residents classifying AGA severity from photographs.
Inter-rater agreement was measured using the intra-class correlation coefficient (ICC).
Intra-rater repeatability was assessed by comparing classifications made by the same individuals over a 3-month period.

Main Results:

The first study showed unsatisfactory inter-rater agreement (ICC = 0.63-0.68).
The second study revealed poor intra-rater repeatability.
No significant differences in reliability were found between experienced dermatologists and residents.

Conclusions:

The reliability of the Hamilton-Norwood scale (HNS) is inadequate, even among expert users.
Reducing the number of HNS classes could improve reliability but would limit its classification precision.
The current HNS may only be suitable for broad patient categorization.