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Butanol odor sensitivity threshold and mean twice-daily odor.
| Butanol (ppm) | No. of participants | No. of twice-daily odor ratings | Mean odor |
|---|---|---|---|
| 10 | 18 | 503 | 1.51 |
| 20 | 21 | 575 | 1.64 |
| 40 | 15 | 405 | 1.32 |
| 80 | 14 | 396 | 1.08 |
| 160 | 17 | 479 | 0.85 |
| 320 | 4 | 97 | 1.39 |
| 640 | 5 | 125 | 1.25 |
| 1,280 | 1 | 20 | 1.55 |
| 2,560 | 1 | 27 | 4.89 |
| 5,120 | 1 | 28 | 2.07 |
| 20,480 | 1 | 28 | 1.00 |
