Laboratory Medicine and Quality Assurance

Table. 3.

Descriptive statistics (means) obtained for EQA data after percentile transformation and then recalibration

Before recalibration Percentile transformation After recalibration
A B C P-value* A B C P-value* A B C P-value*
TSH <0.00001 0.98 0.81
1 0.70 0.67 0.85 0.75 0.74 0.75 0.78 0.72 0.72
2 4.77 4.74 5.26 5.32 4.83 4.83 5.34 4.94 4.60
3 23.86 25.03 27.23 28.01 25.35 25.35 26.84 25.23 24.28
4 0.73 0.71 0.83 0.79 0.79 0.71 0.81 0.77 0.71
5 4.93 5.17 6.33 5.60 5.38 5.56 5.51 5.37 5.54
6 25.03 27.59 34.02 29.52 28.01 29.52 28.17 27.76 30.42
7 4.91 5.16 6.34 5.56 5.32 5.60 5.50 5.36 5.55
8 24.70 28.26 33.86 29.16 28.56 29.16 27.79 28.41 30.28
9 0.72 0.71 0.84 0.79 0.79 0.74 0.80 0.77 0.72
10 0.70 0.70 0.93 0.75 0.75 0.79 0.78 0.76 0.79
11 4.83 5.53 6.17 5.43 5.60 5.38 5.40 5.74 5.40
12 23.80 29.09 32.59 25.35 29.28 28.01 26.78 29.24 29.13
13 0.69 0.70 0.94 0.74 0.75 0.79 0.77 0.76 0.80
14 4.81 5.42 6.21 5.38 5.56 5.43 5.39 5.63 5.44
15 24.43 28.91 33.00 28.56 29.16 28.56 27.49 29.05 29.50
16 24.78 29.50 33.98 29.28 29.52 29.28 27.88 29.64 30.39
17 0.63 0.66 0.86 0.71 0.71 0.75 0.70 0.71 0.73
18 4.49 5.26 6.03 4.83 5.43 5.32 5.02 5.46 5.28
19 19.73 20.82 23.28 21.28 21.28 21.28 22.18 21.06 20.72
20 2.26 2.38 2.79 2.47 2.47 2.47 2.52 2.51 2.41
21 0.11 0.10 0.15 0.12 0.12 0.12 0.12 0.11 0.12
22 1.93 2.06 2.41 2.13 2.13 2.13 2.15 2.18 2.08
23 15.72 16.08 18.49 16.76 16.76 16.76 17.66 16.34 16.40
24 0.08 0.09 0.12 0.10 0.10 0.10 0.10 0.10 0.10
Mean±SD 9.14±10.14 10.22±11.61 11.81±13.39 10.39±11.70 10.39±11.70 10.39±11.70 10.27±11.41 10.36±11.64 10.50±11.99
Median 4.79 5.17 6.1 5.35 5.35 5.35 5.37 5.37 5.34
T3 <0.00001 0.72 0.77
1 0.91 0.10 1.27 1.04 1.02 1.07 1.08 1.03 1.07
2 1.61 1.68 2.00 1.83 1.74 1.74 1.84 1.72 1.74
3 2.47 2.70 3.13 2.76 2.76 2.80 2.75 2.73 2.81
4 0.91 1.01 1.20 1.05 1.07 1.02 1.08 1.04 1.01
5 1.78 1.87 2.11 1.95 1.89 1.89 2.02 1.91 1.85
6 2.54 2.77 3.15 2.80 2.82 2.82 2.82 2.79 2.83
7 1.68 1.85 2.09 1.87 1.87 1.87 1.91 1.88 1.83
8 2.56 2.75 3.11 2.92 2.80 2.76 2.84 2.77 2.79
9 0.93 1.01 1.23 1.07 1.05 1.05 1.10 1.04 1.04
10 0.86 0.97 1.21 1.02 0.98 1.04 1.02 1.00 1.02
11 1.68 1.92 2.15 1.89 1.95 1.95 1.92 1.96 1.88
12 2.56 2.96 3.24 2.82 2.92 2.92 2.84 2.98 2.92
13 0.82 1.00 1.18 0.99 1.04 0.99 0.98 1.04 0.99
14 1.53 1.82 2.01 1.74 1.80 1.80 1.76 1.85 1.75
15 2.69 3.17 3.36 3.07 3.07 3.07 2.98 3.19 3.03
16 2.59 3.13 3.28 3.00 3.00 3.00 2.88 3.15 2.96
17 0.81 0.97 1.18 0.98 0.99 0.98 0.96 1.00 0.99
18 1.56 1.84 2.04 1.80 1.83 1.83 1.79 1.87 1.78
19 3.53 3.85 4.47 3.94 3.94 4.02 3.84 3.85 4.11
20 2.08 2.12 2.63 2.28 2.28 2.28 2.34 2.15 2.34
21 0.51 0.66 0.88 0.68 0.68 0.68 0.63 0.69 0.73
22 2.30 2.38 2.82 2.50 2.50 2.50 2.57 2.41 2.52
23 3.66 3.94 4.44 4.02 4.02 3.94 3.98 3.94 4.09
24 0.41 0.48 0.64 0.51 0.51 0.51 0.51 0.50 0.51
Mean±SD 1.79±0.92 1.96±1.05 2.28±1.08 2.02±1.00 2.02±1.00 2.02±1.00 2.02±0.98 2.02±0.99 2.02±1.02
Median 1.68 1.86 2.10 1.88 1.88 1.88 1.92 1.90 1.84
FT4 <0.00001 0.93 0.81
1 1.18 0.95 1.49 1.21 1.21 1.21 1.29 1.12 1.23
2 2.72 2.72 3.24 2.89 2.89 2.89 3.05 2.92 2.74
3 4.87 4.34 5.68 5.05 5.05 4.68 5.58 4.47 4.92
4 0.85 0.71 1.12 0.90 0.81 0.90 0.91 0.86 0.92
5 2.15 2.35 2.89 2.37 2.47 2.47 2.39 2.56 2.44
6 3.44 4.03 5.00 4.08 4.19 4.19 3.89 4.18 4.31
7 2.17 2.34 2.77 2.43 2.43 2.43 2.41 2.55 2.33
8 3.52 3.97 4.84 4.19 4.08 4.08 3.99 4.12 4.17
9 0.85 0.71 1.17 0.93 0.78 0.93 0.92 0.86 0.96
10 0.93 0.76 1.28 0.99 0.93 1.01 1.00 0.91 1.05
11 2.39 2.52 3.13 2.72 2.65 2.72 2.67 2.72 2.65
12 3.20 3.47 4.21 3.71 3.59 3.59 3.62 3.64 3.60
13 0.93 0.80 1.26 0.99 1.01 0.99 1.01 0.95 1.03
14 2.18 2.24 2.72 2.47 2.37 2.37 2.42 2.44 2.29
15 3.09 3.32 4.01 3.48 3.48 3.48 3.49 3.50 3.43
16 3.07 3.15 3.98 3.40 3.40 3.40 3.46 3.34 3.39
17 0.96 0.78 1.25 1.01 0.99 0.99 1.04 0.93 1.03
18 2.30 2.36 2.97 2.65 2.53 2.53 2.57 2.56 2.51
19 4.04 4.32 5.95 4.68 4.68 5.05 4.60 4.46 5.15
20 2.26 2.63 3.11 2.53 2.72 2.65 2.52 2.83 2.64
21 0.71 0.73 0.93 0.78 0.90 0.78 0.76 0.88 0.75
22 1.62 1.72 2.10 1.81 1.81 1.81 1.79 1.92 1.75
23 3.11 3.60 4.32 3.59 3.71 3.71 3.51 3.77 3.70
24 0.73 0.78 0.97 0.81 0.99 0.81 0.79 0.93 0.79
Mean±SD 2.22±0.24 2.30±1.29 2.93±1.56 2.49±1.34 2.49±1.34 2.49±1.34 2.49±1.35 2.48±1.29 2.49±1.37
Median 2.22 2.36 2.93 2.50 2.50 2.50 2.47 2.56 2.48

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

*P-value by Friedman test.
Lab Med Qual Assur 2024;46:214~224 https://doi.org/10.15263/jlmqa.2024.46.4.214
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