Table 2. Three-factor BBD for RSM with Experimental and Pre-dicted Values of Degradation Efficiency for Orange II at Various Conditions
| Run | Factors | Degradation efficiency (%) |
| X1 | X2 | X3 | Experimental | Predicted |
| 1 | 0 | 0 | 0 | 64.53 | 66.39 |
| 2 | 1 | 0 | -1 | 54.14 | 54.21 |
| 3 | -1 | -1 | 0 | 63.10 | 61.69 |
| 4 | 1 | 0 | 1 | 73.79 | 73.00 |
| 5 | -1 | 1 | 0 | 40.58 | 41.26 |
| 6 | 0 | 1 | -1 | 42.92 | 41.44 |
| 7 | 0 | 0 | 0 | 66.85 | 66.39 |
| 8 | 0 | 0 | 0 | 65.12 | 66.39 |
| 9 | -1 | 0 | -1 | 41.39 | 42.18 |
| 10 | 0 | -1 | 1 | 80.35 | 82.93 |
| 11 | 0 | 0 | 0 | 67.65 | 66.39 |
| 12 | -1 | 0 | 1 | 63.36 | 63.29 |
| 13 | 0 | 1 | 1 | 57.44 | 56.83 |
| 14 | 1 | -1 | 0 | 73.25 | 72.57 |
| 15 | 0 | -1 | -1 | 56.7 | 57.32 |
| 16 | 0 | 0 | 0 | 67.81 | 66.39 |
| 17 | 1 | 1 | 0 | 50.71 | 52.12 |