2.4.2 Modification of the olfactory identification test
(1) Preparation of the olfactory test: First, we did not change the
odors in the SSOI test but adjusted the distractors according to the
odor familiarity results and randomly replaced the unfamiliar
distractors with the distractors with a odor familiarity score hi-gher
than 7522, to form the MDOI test. Then, we used
tetrahydrothiophene, 2-methylpy-razine, and trimethylindole to simulate
natural gas, burnt smell, and fecal odor, respecti-vely, and distractors
were randomly assigned to the three odors.
(2) Olfactory identification test modification: First, the SSOI test was
conducted on 100 volunteers. Then the volunteers were tested by MDOI
test after 30 minutes, with the test process unchanged. Finally, the
volunteers were tested with three odors of natural gas, burnt smell, and
Fecal odor to complete the olfactory identification test.