Analysis of the external quality assessment of fluoride in water in Liaoning Province in 2016 / 中华地方病学杂志

ABSTRACT

Objective To evaluate the detection capability in determining water fluoride at center for disease control and prevention (CDC) of Liaoning Province, and to promote the improvement of detection quality. Methods The detection results of the external quality assessment of fluoride in water from 66 CDC labs in Liaoning Province in 2016 were analyzed by using standard Z score. The potential outliers were determined by Youden plot. The determine standard of the Z score│Z│≤2 was satisfacted;2<│Z│<3 was qualified,but suggesting there was a problem, need to find the cause of the error; │Z│≥3 was not satisfied. Results According to the results of standard Z score,there were 66 labs satisfacted, the satisfacted rate was 100.0% (66/66). According to the Youden plot, there were 4 possible outliers (6.1%, 4/66) which need to be rechecked. Conclusions The capability in determining water fluoride at CDC of Liaoning Province meet the standards, but individual laboratories need to improve the quality of testing. The internal quality control of the laboratory is very important. All CDCs should improve the detection capability continuously.