Chemical Senses Advance Access originally published online on April 10, 2009
Chemical Senses 2009 34(5):435-440; doi:10.1093/chemse/bjp018
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Test–Retest Reliability of the San Diego Odor Identification Test and Comparison with the Brief Smell Identification Test
1 Departments of Ophthalmology and Visual Sciences 2 Population Health Sciences, University of Wisconsin School of Medicine and Public Health, 610 Walnut Street, Madison, WI 53726, USA 3 Institute of Statistics, National Chiao Tung University, 1001 Ta Hsuch Road, Hsinchu 30010, Taiwan
Correspondence to be sent to: Elizabeth M. Krantz, Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Room 1048, 610 Walnut Street, Madison, WI 53726, USA. e-mail: krantz{at}episense.wisc.edu
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Abstract |
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This study described the San Diego Odor Identification Test (SDOIT) reliability and compared the SDOIT and the Brief Smell Identification Test (B-SIT). Ninety participants aged 50–70 years completed this 2-visit olfaction study. During visit 1, the SDOIT and B-SIT were administered according to standard protocols. Three weeks later, participants returned to retake the SDOIT. The SDOIT score was the total number of odorants correctly identified out of 8 odorants presented, and olfactory impairment was defined as correctly identifying less than 6 odorants. The B-SIT score was the total number of odorants correctly identified out of 12 odorants presented, and participants correctly identifying less than 9 odorants were categorized as abnormal. The SDOIT reliability was high (concordance correlation coefficient = 0.85, 95% confidence interval [CI] = 0.79–0.91). The same score was obtained on retest for 73% of participants, whereas 18% improved, and 9% declined. Test–retest agreement was 96% for the SDOIT; 4% improved from impaired at visit 1 to unimpaired at visit 2. Overall, SDOIT impairment classification and B-SIT abnormal classification agreed in 96% of participants (
= 0.81, 95% CI = 0.63–0.99). In conclusion, the SDOIT showed good test–retest reliability. Agreement for impaired/abnormal olfaction was demonstrated for the SDOIT and the B-SIT.
Key words: epidemiology, impairment, methods, olfaction
Accepted 13 March 2009