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| Period | N* | Lab’s Result | Mean of group* | Bias (%) | MU |
|---|---|---|---|---|---|
| May |
32 |
34.4 |
34.0 |
0.8 |
0.04 |
| July |
38 |
92.4 |
82.1 |
9.7 |
0.11 |
| September |
35 |
84.7 |
83.5 |
1.1 |
0.11 |
| November |
33 |
31.1 |
34.3 |
–5.5 |
0.08 |
| N - Number of participants using the same method; MU - Measurement uncertainty *Mean of the results of the laboratories using the HPLC method | |||||
