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Correspondence between three olfactory tests and suprathreshold odor intensity ratings.
Sari Koskinen1, Seija Vento, Henrik Malmberg
1Department of Food Technology, University of Helsinki, Finland. sari.ml.koskinen@helsinki.fi
Acta Oto-Laryngologica
|October 30, 2004
Summary
Three olfactory tests effectively classify smell function (normosmia, hyposmia, anosmia) and correlate with odor intensity ratings, though individual diagnoses varied slightly. Advanced age impacts olfactory performance.
Area of Science:
- Neuroscience
- Sensory Science
- Otolaryngology
Background:
- Olfactory dysfunction affects quality of life.
- Standardized tests are crucial for diagnosing smell disorders.
Purpose of the Study:
- To compare the diagnostic capabilities of three olfactory tests.
- To assess the relationship between olfactory test performance and odor intensity perception.
- To evaluate the impact of age on olfactory function.
Main Methods:
- 48 subjects (15-84 years) completed the European Test of Olfactory Capabilities, Sniffin' Sticks, and Cross-Cultural Smell Identification Test.
- Subjects rated vanilla and lemon aroma intensity.
- Background questionnaire and olfactory diagnoses were analyzed.
Main Results:
- High correlation between the three olfactory tests in classifying normosmia, hyposmia, and anosmia.
- Individual test results showed some discrepancies in diagnoses.
- Principal component analysis revealed distinct olfactory dimensions: detection/discrimination/identification, intensity ratings, and threshold.
- Older age was associated with poorer olfactory performance.
Conclusions:
- All three olfactory tests are valid for clinical assessment of olfactory capabilities.
- The tests reliably differentiate between anosmia and normosmia, and assess hyposmia.
- Suprathreshold odor intensity ratings represent a dimension of olfaction distinct from the tested diagnostic categories.