NIPH Clinical Trials Search

Survey of olfactory disorders using the Japanese national database

Basic Information

Recruitment status	Not Recruiting
Health condition(s) or Problem(s) studied	Olfactory disorders
Date of first enrollment	19/05/2026
Target sample size	500000
Countries of recruitment
Study type	Observational
Intervention(s)

Outcome(s)

Primary Outcome	Prescription rates by type of drug therapy and their changes over time, incidence of comorbid symptoms, implementation status of olfactory function tests, and distribution of olfactory testing by region and medical institution
Secondary Outcome

Key inclusion & exclusion criteria

Age minimum	Not applicable
Age maximum	Not applicable
Gender	Both
Include criteria	Patients suffering from olfactory disorders between April 2009 and June 2025
Exclude criteria	No setting