Table 4: Calculated reference ranges for copper (μmol/L) in dependence on the different feeding groups (A and B) and lactations (1 and 2).

Parametric calculationNon parametric calculation

Group A (n = 170)6–178–18
Group B (n = 172)7–188–19
Lactation 1 (n = 212)6–178–19
Lactation 2 (n = 130)7–178–18