Laboratory Medicine and Quality Assurance

Table. 6.

Table 6

Differences between methods before and after recalibration of clinical data

Variable	A vs. B		A vs. C		B vs. C
Variable	Before recalibration	After recalibration	Before recalibration	After recalibration	Before recalibration	After recalibration
TSH
Mean difference±SD	0.81±2.14	0.11±2.16	1.21±1.85	−0.62±1.31	0.39±1.54	−0.72±1.34
P-value*	0.0002	0.61	<0.0001	<0.0001	0.01	<0.0001
T3
Mean difference±SD	−0.15±0.34	−0.34±0.38	0.15±0.25	−0.30±0.24	0.30±0.36	0.04±0.32
P-value*	0.0001	<0.0001	<0.0001	<0.0001	<0.0001	0.28
FT4
Mean difference±SD	0.25±0.55	0.24±0.46	0.97±0.95	0.39±0.67	0.73±0.57	0.15±0.45
P-value*	0.0001	<0.0001	<0.0001	<0.0001	<0.0001	0.004

Abbreviations: TSH, thyroid stimulating hormone; T3, triiodothyronine; FT4, free thyroxine; SD, standard deviation.

*P-value by paired t-test.