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Allred scoring system
| PS | Observation (%) | IS | Observation |
|---|---|---|---|
| 0 | None | 0 | None |
| 1 | 1 | 1 | Weak |
| 2 | 1-10 | 2 | Intermediate |
| 3 | 10-33 | 3 | Strong |
| 4 | 33-66 | ||
| 5 | 66-100 | ||
| Sum of PS and IS | |||
| Final score | Interpretation | ||
| 0-2 | Negative | ||
| 3-8 | Positive | ||
PS: Proportion score; IS: Intensity score
