Table 1. Results of the Threshold Screening Tests (TSTs).
| Solutions | Concentration (mg/ml) |
pH | Threshold test | Number of sprays | Detection time (S) | |
|---|---|---|---|---|---|---|
| PassN (%) |
FailN (%) |
Mean ± SD | Mean ± SD | |||
| Placebo | -- | - | 44 (71) | 18 (29)* | 15.68 ± 8.04 | 22.08 ± 11.49 |
| BitrexTM | 0. 135 | 6.91 | 60 (96.8) | 2 (3.2) | 5.32 ± 4.18 | 7.96 ± 4.96 |
| A. vera | 10.7 | 7.50 | 52 (83.9) | 10 (16.1) | 7.54 ± 6.32 | 11.02 ± 7.58 |
| 18.8 | 7.11 | 43 (69.4) | 19 (30.6) | 7.65 ± 5.83 | 10.84 ± 6.8 | |
| 26.2 | 7.02 | 43 (69.4) | 19 (30.6) | 8.81 ± 7.22 | 13.58 ± 11.33 | |
| 41.7 | 6.70 | 53 (85.5) | 9 (14.5) | 7.04 ± 6.016 | 9.75 ± 6.97 | |
| 58.3 | 6.43 | 53 (85.5) | 9 (14.5) | 6.87 ± 4.87 | 9.43 ± 6.01 | |
| 75.0 | 6.25 | 57 (91.9) | 5 (8.07) | 6.23 ± 5.68 | 9.12 ± 7.43 | |
| 91.7 | 6.14 | 53 (85.5) | 9 (14.51) | 4.81 ± 3.07 | 7.27 ± 3.54 | |
*18 (29%) of the participants reported the placebo as a sweet, salty, or bitter taste.