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Fonterra Co-operative Group

Page 12

Table 9: Vitamin D

2

recovery of spiked samples at 50% of typical concentrations

Sample

Mean

Recovery

(RSD%)

Child Formula Powder

97 (5.0)

Infant Elemental Powder

98 (2.2)

Adult Nutritional RTF High Protein

98 (1.3)

Adult Nutritional RTF High Fat

98 (2.6)

Infant Formula RTF, Milk-Based

97 (4.4)

Table 10: Vitamin D

3

recovery of spiked samples at 100% of typical concentrations

Sample

Mean

Recovery

(RSD%)

Child Formula Powder

101 (0.8)

Infant Elemental Powder

98 (1.5)

Adult Nutritional RTF High Protein

98 (0.9)

Adult Nutritional RTF High Fat

101 (1.2)

Infant Formula RTF, Milk-Based

98 (0.6)

Table 11: Vitamin D

3

recovery of spiked samples at 50% of typical concentrations

Sample

Mean

Recovery

(RSD%)

Child Formula Powder

100 (3.1)

Infant Elemental Powder

96 (0.8)

Adult Nutritional RTF High Protein

98 (1.2)

Adult Nutritional RTF High Fat

101 (4.1)

Infant Formula RTF, Milk-Based

94 (0.6)

Bias Against CRM

Bias is a measurement of systematic error representing the difference between measured value and true

value. However, as the true value is unknown, an accepted reference value substituted for true value. A

certified reference material (CRM) contains assigned values accompanied by an uncertainty and stated level

of confidence.

Bias is evaluated by replicate analyses of a CRM with a declared concentration and uncertainty.

Differences between the measured value and certified value are determined with the mean and standard

deviation of the differences, and the test-statistic (T

stat

) calculated (Equation 8). The null hypothesis is that

there is no difference between the measured results and the certified value (H

0

:

݀ ൌ Ͳ

). At the α

= 0.05 level

VitD-18 (February 2016)

FOR ERP USE ONLY

DO NOT DISTRIBUTE