| Effect | Number | Score |
| Variable | |
Step | Entered | DF | In | Chi-Square | Pr > ChiSq | Label |
1 | volume | 1 | 1 | 41.8192 | <0.0001 | volume |
2 | q 2 | 1 | 2 | 10.1273 | 0.0015 | q 2 |