OPEN ACCESS pISSN 2234-3806
eISSN 2234-3814

Table. 1.

Table. 1.

Bias based on KEQAS ABCr PT survey data from 2011 to 2019

Trial Total N of participating labs N of response results* N of outliers Bias (%) Bias (mg/dL)


Mean (95% CI) SD Mean (95% CI) SD
2011-A 54 161 1 10.82 (9.45–12.19) 12.15 0.096 (0.080–0.112) 0.102
2011-B 56 166 0 7.12 (5.77–8.46) 11.02 0.075 (0.058–0.091) 0.108
2012-A 103 303 2 9.33 (8.33–10.33) 10.79 0.082 (0.072–0.092) 0.090
2012-B 108 323 0 6.18 (5.22–7.15) 9.86 0.062 (0.050–0.073) 0.105
2013-A 140 420 1 5.78 (4.93–6.62) 10.10 0.049 (0.036–0.061) 0.133
2013-B 139 416 0 7.63 (6.78–8.48) 10.81 0.066 (0.057–0.074) 0.091
2014-A 176 527 4 4.04 (3.29–4.80) 11.29 0.024 (0.013–0.036) 0.132
2014-B 167 501 2 –0.01 (–0.79–0.76) 7.07 –0.004 (–0.012–0.004) 0.091
2015-A 175 525 1 1.36 (0.60–2.11) 6.67 0.018 (0.011–0.026) 0.090
2015-B 178 534 1 3.64 (2.89–4.39) 7.97 0.036 (0.028–0.045) 0.100
2016-A 146 437 3 2.37 (1.54–3.20) 7.69 0.02 (0.011–0.029) 0.098
2016-B 150 450 2 4.01 (3.20–4.83) 10.04 0.027 (0.019–0.036) 0.091
2017-A 153 459 3 1.77 (0.96–2.58) 8.82 0.008 (0.000–0.015) 0.080
2017-B 167 501 3 2.05 (1.27–2.82) 8.95 0.014 (0.008–0.02) 0.068
2018-A 197 591 1 2.36 (1.65–3.07) 8.57 0.008 (0.000–0.015) 0.093
2018-B 200 600 0 3.87 (3.17–4.58) 8.11 0.033 (0.027–0.039) 0.074
2019-A 227 681 2 0.45 (–0.21–1.11) 6.40 –0.003 (–0.009–0.003) 0.077
2019-B 227 681 2 0.20 (–0.47–0.86) 7.36 –0.018 (–0.026––0.009) 0.111

*N=3 samples per trial; An outlier was defined as a result with an absolute percentage bias >50% of the target Cr concentration.

Abbreviations: ABCr PT, accuracy-based creatinine proficiency testing; Cr, creatinine; KEQAS, Korean Association of External Quality Assessment Service.

Ann Lab Med 2021;41:372~379 https://doi.org/10.3343/alm.2021.41.4.372

© Ann Lab Med