Interrater Agreement of Rater and Subject Assessment of Male Pattern Hair Loss

February 1998 in “ Journal of Investigative Dermatology ”

Flayius Lilly, Wm. Cameron Chumlea, Shumei Guo, Thomas Rhodes, Cynthia J. Girman

male pattern hair loss Norwood/Hamilton classification frontal balding baldness hair loss

TLDR Men often see themselves as balder than experts do.

The study investigated the interrater agreement between self-assessments and trained observer assessments of male pattern hair loss in 273 Caucasian men aged 18-50. The findings revealed a low level of agreement, with kappa coefficients of 0.29 for the Norwood/Hamilton classification and 0.66 for the textual scale. Men tended to rate themselves as slightly balder than the observer, particularly those with greater frontal balding. The study suggested that self-perception of hair loss might be biased and more predictive of men seeking medical care or treatment than objective assessments.

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