| Scale |
Result |
| 0 |
The allergic reaction was equal to the negative control reaction |
| + |
The mean wheal diameter was higher than the allergenic reaction to the negative control fluid, and less than half of the mean histamine wheal diameter |
| ++ |
The mean allergic wheal diameter was equal to or greater than half of the mean histamine wheal diameter |
| +++ |
The mean allergic wheal diameter was equal to or greater than the mean histamine wheal diameter |
| ++++ |
The mean allergic wheal diameter was at least two-fold greater than the mean histamine wheal diameter or every reaction with pseudopodia |
