| Nominal Level (pg/ml) |
Intra-day *Measured Levels |
Inter-day *Measured Levels |
| Mean |
SD |
CV (%) |
Bias (%) |
Mean |
SD |
CV (%) |
Bias (%) |
| 20 |
19.4 |
1.8 |
9.5 |
3.0 |
20.2 |
2.3 |
11.3 |
1.0 |
| 60 |
57.3 |
3.3 |
5.7 |
4.5 |
57.2 |
3.7 |
6.5 |
4.7 |
| 200 |
210.1 |
17.2 |
8.2 |
5.1 |
202.6 |
21.0 |
10.4 |
1.3 |
| 360 |
391.3 |
18.5 |
4.7 |
8.7 |
373.1 |
30.2 |
8.1 |
3.6 |
SD, standard deviation, CV, Coefficient of variation as a measurement of imprecision= standard deviation divided by mean measured concentration x 100. Bias, measured level - nominal level divided by nominal level x 100. |
