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This study found that the parietal/occipital hair density ratio decreases significantly only when baldness is visibly present, making it no better than the Hamilton/Norwood scale for assessing baldness severity.

In this study, researchers found that using a handheld digital microscope, hair diameter was a better determinant of perceived alopecia severity in androgenetic alopecia than hair density.

In this study, reduced hair density, diameter, and follicle miniaturization were key characteristics of female pattern hair loss in Southern Chinese women, with occipital and temporal sites also affected.

This study reports that quantitative trichoscopy, while noninvasive and convenient, provides less accurate hair density data compared to invasive histopathologic examination, which was demonstrated in a sample of adult Chinese individuals without alopecia.

In this study, researchers examined men with early-stage androgenetic alopecia and found distinct patterns of hair loss correlated with genetic and hormonal factors, noting that parietal region pattern hair loss responded better to minoxidil and micronutrient treatment compared to occipital region pattern.