Setting reference values in trichology

Abstract

Taking the mean ± 2SD as normal values, our "normal" V/O of density ranged between 0.73 and 1.41 and our "normal" V/0 of diameter between 0.8 and 1.24. People with lower ratios would have, therefore, AGA with 95% of probability. Moreover, we found that hair shedding using the hair pull test and the modified wash test come to 1-2 hairs/day.

Trichoscopic features of hair and scalp in noncomplaining individuals: A descriptive study

“…This was in contrast to the results of another study 14 . As regards the hair thickness, we found that the frontal and temporal areas' values were less than that of the occipital area, which was in contrast to other studies 15,16 . Differences in age groups may explain the reported difference.…”

“…Upon comparing hair parameters in both genders, in this study generally the male values for density, thickness, and average hair count/unit were significantly greater than the females' values, which come in contrast with other studies 14,16,21 . This discrepancy in the findings might be due to different age ranges of the studied groups.…”

On-chip lens-less holographic trichoscopy / trichometry technologies: microinterferometric, Fourier spectral and correlographic techniques for clinical trichology.

“…8 труднена в силу трудности ввода референсных значений нормы и отклонений [2] в компьютер-ные экспертные системы, что требует, в идеаль-ном случае, связанном с автоматическим распо-знаванием образов, также сопоставления наибо-лее общих морфологически выявляемых харак-теристик заболеваний (так называемых дескрип-торов) с соответствующими диагностируемыми классами путём машинного обучения (supervised learning). В то же время, доныне отсутствуют технологии аналитической микроскопии волос в унифицированных по калибровке условиях, что было бы достаточно для создания ценной для специалистов-трихологов системы компьютер-ной диагностики состояния волос.…”

Hair Evaluation Method: Pull Test and Wash Test

“…In physiology, the pull test performed on 60 healthy children (4-10 years old) established that the normal mean loss was 1.77 AE 1.57 (Rebora et al 2016).…”