Table 4. Analytical proficiency test (Food Analysis Performance Assessment Scheme) for retinol, α-tocopherol, and cholesterol
| Analytes | Sample | Assigned value | Analytical value | z-Score |
| Vitamin A1)(μg/100 g) | Mixed fat spread | 52.8 | 50.03 | -0.6 |
| Vitamin E2)(mg/100 g) | Infant formula | 11.0 | 12.02 | 0.9 |
| Cholesterol (mg/100 g) | Infant formula | 521.0 | 508.90 | -0.2 |
1)As retinol, the sum of cis- and trans-isomers.
2)As α-tocopherol content.