Abstract
Objectives:
The Snap & Sniff® Threshold Test (S&S) has been recently developed to determine the olfactory threshold. The aim of this study was to further evaluate the validity and test–retest reliability of the S&S.
Methods:
The olfactory thresholds of 120 participants were determined using both the Smell Threshold Test (STT) and the S&S. The participants included 30 normosmic volunteers and 90 patients (60 hyposmic, 30 anosmic). The normosmic participants were retested using the STT and S&S at an intertest interval of at least 1 day.
Results:
The mean olfactory threshold determined with the S&S was −6.76 for the normosmic participants, −3.79 for the hyposmic patients, and −2 for the anosmic patients. The olfactory thresholds were significantly different across the 3 groups (P < .001). Snap & Sniff–based and STT-based olfactory thresholds were correlated weakly in the normosmic group (correlation coefficient = 0.162, P = .391) but more strongly correlated in the patient groups (hyposmic: correlation coefficient = 0.376, P = .003; anosmic: correlation coefficient = 1.0). The test–retest correlation for the S&S-based olfactory thresholds was 0.384 (P = .036).
Conclusion:
Based on validity and test–retest reliability, we concluded that the S&S is a proper test for olfactory thresholds.
Keywords
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