Table 8. z-Scores of retinol and α-tocopherol analyses in a proficiency test (Food Analysis Performance Assessment Scheme, FAPAS)
| Analytes | Test sample name | Assigned value | Analytical value | z-Score |
| Vitamin A1) (μg/100 g) | Powdered baby food | 492.0 | 483.94 | −0.1 |
| Vitamin E2) (mg/100 g) | 11.4 | 10.17 | −1.1 |
As retinol, the sum of cis- and trans-isomers
As α-tocopherol