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Number and characteristics of the subgroups of subjects tested for odor detection of each carboxylic acid and of the common subjects tested with all five acids
| Subject subgroups | Number of subjects | Average age (years ± SD) | Age range | Number of females | Number of males |
|---|---|---|---|---|---|
| Formic acid | 18 | 24 ± 5 | 19–37 | 12 | 6 |
| Acetic acid | 16 | 22 ± 3 | 19–29 | 10 | 6 |
| Butyric acid | 14 | 24 ± 5 | 19–37 | 9 | 5 |
| Hexanoic acid | 18 | 24 ± 5 | 19–37 | 9 | 9 |
| Octanoic acid | 14 | 23 ± 3 | 20–30 | 8 | 6 |
| Common subjects | 3 | 25 ± 3 | 22–27 | 2 | 1 |
