Fig. 3. Forest plot of mean percentage bias in the ABCr PT survey stratified by year. (A) Reagent manufacturer group. (B) Instrument manufacturer group. A and B in parenthesis are the number of participating laboratories in the first and second ABCr PT survey of the year, respectively. Abbreviations: ABCr PT, accuracy-based creatinine proficiency testing; CI, confidence interval.

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