|
Comparison of stability between instruments of three methods: A. internal self mean ratio; B. ratios based on an external assay; and C raw instrument data. Internal self mean (A) is the most reliable. Using external ratios, (2C) is a close second, and raw readings, (2C) show the greatest deviation between instruments. |
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| Ratios N = 32 for all. |
Mean z score |
Median z score |
Max z |
Min z |
|
|
|
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| A |
Ratios on internal self mean |
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| Rh. Sera 1:50 |
1.07 |
0.84 |
2.08 |
0.52 |
|
| Rh. Sera 1:100 |
0.96 |
0.92 |
1.21 |
0.76 |
|
| Rh. Sera 1:200 |
1.86 |
2.31 |
3.50 |
0.14 |
|
|
|
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| B |
Ratios on real external mean (SRV/SFV mean and SFV/SRV mean) |
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| Rh. Sera 1:50 |
1.70 |
1.82 |
2.50 |
0.50 |
|
| Rh. Sera 1:100 |
1.44 |
1.44 |
3.83 |
0.27 |
|
| Rh. Sera 1:200 |
16.38 |
11.97 |
49.47 |
4.59 |
|
|
|
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| C |
Raw inter instrument comparisons |
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| Rh. Sera 1:50 |
1.19 |
1.09 |
1.75 |
0.61 |
|
| Rh. Sera 1:100 |
8.14 |
7.91 |
9.69 |
6.98 |
|
| Rh. Sera 1:200 |
46.04 |
43.89 |
65.40 |
26.52 |
|
Hanley Theoretical Biology and Medical Modelling 2007 4:32 doi:10.1186/1742-4682-4-32 |
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