Differences between methods before and after recalibration of EQA data
| A vs. B | A vs. C | B vs. C | ||||||
|---|---|---|---|---|---|---|---|---|
| Before recalibration | After recalibration | Before recalibration | After recalibration | Before recalibration | After recalibration | |||
| TSH | ||||||||
| Mean difference±SD | 1.08±1.69 | 0.09±0.89 | 2.67±3.43 | 0.23±1.26 | 1.59±1.90 | 0.15±0.73 | ||
| P-value |
<0.05 | 0.63 | <0.05 | 0.37 | <0.05 | 0.34 | ||
| T3 | ||||||||
| Mean difference±SD | 0.17±0.25 | 0.002±0.11 | 0.49±0.17 | 0.006±0.09 | 0.33±0.22 | 0.004±0.10 | ||
| P-value |
<0.05 | 0.93 | <0.05 | 0.73 | <0.05 | 0.85 | ||
| FT4 | ||||||||
| Mean difference±SD | 0.08±0.26 | −0.01±0.27 | 0.71±0.44 | 0.004±0.22 | 0.63±0.33 | 0.02±0.21 | ||
| P-value |
0.12 | 0.85 | <0.05 | 0.93 | <0.05 | 0.73 | ||
Abbreviations: EQA, external quality assessment; TSH, thyroid stimulating hormone; T3, triiodothyronine; FT4, free thyroxine; SD, standard deviation.
*P-value by paired t-test.