Cryoprotectant | Symbol | Variable values at each level of each variable and code | |||||
| Unencoded | Coded | −1.682 | −1 | 0 | +1 | +1.682 |
Skim milk | X1 | x1 | 5% | 9.06% | 15% | 24.06% | 25% |
Sucrose | X2 | x2 | 1% | 2.22% | 4% | 6.22% | 7% |
Trehalose | X3 | x3 | 0% | 1.62% | 4% | 5.63% | 8% |