Table I. Scheme of the trichoscopic images evaluation in presented study.

Parameter	Method of the evaluation
Vellus hairs	number of vellus hairs calculated in one field of vision (FOV) at 20-fold magnification total number of vellus hairs in four FOVs at 70-fold magnification highest result in one FOV from the above (at 70-fold magnification)
Distribution of hair thickness	percentage of thin hairs (less than 0.03mm) percentage of medium-sized hairs (0.03mm to 0.05mm) percentage of thick hairs (above 0.05mm) mean hair thickness (mm)
Pilosebaceous units	percentage of single-hair units (at 20-fold magnification) percentage of double-hairs units percentage of triple-hairs units
Yellow dots	number of yellow dots per FOV calculated at 20-fold magnification number of yellow dots per FOV calculated in four fields of vision at 70-fold magnification the highest result from the above (at 70-fold magnification)
Perifollicular yellow discoloration (hyperpigmentation)	percentage of follicular ostia with perifollicular yellow discoloration calculated 20-fold magnification number of follicular ostia with perifollicular yellow discoloration in four FOVs at 70-fold magnification the highest result from the above (at 70-fold magnification)
Other	white dots (scarified follicular ostia), cadaverized hairs, broken hairs desquamation (rated 0-4) presence of abnormal blood vessels presence of exclamation mark hairs