Erythema and edema scores were used to determine the primary irritation index
| Observation | Values |
|---|---|
| Erythema | |
| No erythema | 0 |
| Very slight erythema (barely perceptible) | 1 |
| Well-defined erythema | 2 |
| Moderate to severe erythema | 3 |
| Severe erythema (beef redness) | 4 |
| Oedema | |
| No oedema | 0 |
| Very slight oedema (barely perceptible) | 1 |
| Slight oedema (edges of area well-defined by definite raising) | 2 |
| Moderate oedema (raised approximately 1 mm) | 3 |
| Severe oedema (extending beyond the area of exposure) | 4 |