We read the letter of Arana Fernandez et al. regarding our paper entitled "Prevalence and 6-month recovery of olfactory dysfunction: a multicentre study of 1363 COVID-19 patients." The authors highlighted the fact that psychophysical olfactory evaluations (Sniffin'Sticks test) are not objective but subjective testing. We partly agree with this statement. The Sniffin'Sticks test (Burghardt®, Wedel, Germany) is a psychophysical test developed by Hummel in 1997 that allows a semi-objective assessment of the patient's olfactory performance.
Psychophysical evaluations are important, usefulness and usability approaches to study the smell disorder related to COVID-19