Table 1.

Six-point rating scale of odor intensity and nine-point rating scale of pleasantness/unpleasantness.

(1) Six-point rating scale of odor intensity	(2) Nine-point rating scale of pleasantness/unpleasantness.
0: Odorless	-4: Extremely unpleasant
1: Barely perceptible odor	-3: Highly unpleasant
2: Faint but source-discriminative odor	-2: Unpleasant
3: Easily perceptible odor	-1: Slightly unpleasant
4: Strong odor	O: Equivocally pleasant
5: Extremely strong odor	+1: Slightly pleasant
	+2: Pleasant
	+3: Highly pleasant
	+4: Extremely pleasant