Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
References
1. Ialongo C, Bernardini S. Long story short: an introduction to the short-term and long term Six Sigma quality and its importance in laboratory medicine for the management of extra-analytical processes. Clin Chem Lab Med 2018;56:1838–45.10.1515/cclm-2018-0310Search in Google Scholar
2. Coskun A. Six Sigma and laboratory consultation. Clin Chem Lab Med 2007;45:121–3.10.1515/CCLM.2007.023Search in Google Scholar
3. Emura T, Lin YS. A comparison of normal approximation rules for attribute control charts. Qual Reliab Engng Int 2015;31:411–8.10.1002/qre.1601Search in Google Scholar
4. Krishnamoorthy K. Handbook of statistical distributions with applications, 2nd ed. FL, USA: CRC Press, Taylor and Francis Group, 2016.10.1201/b19191Search in Google Scholar
5. Coskun A, Serteser M, Kilercik M, Aksungar F, Unsal I. A new approach to calculating the Sigma Metric in clinical laboratories. Accred Qual Assur 2015;20:147–52.10.1007/s00769-015-1113-8Search in Google Scholar
6. Coskun A, Oosterhuis WP, Serteser M, Unsal I. Sigma metric or defects per million opportunities (DPMO): the performance of clinical laboratories should be evaluated by the Sigma metrics at decimal level with DPMOs. Clin Chem Lab Med 2016;54:e217–9.10.1515/cclm-2015-1219Search in Google Scholar
7. Oosterhuis WP, Coskun A. Sigma metrics in laboratory medicine revisited: We are on the right road with the wrong map. Biochem Med (Zagreb) 2018;28:020503.10.11613/BM.2018.020503Search in Google Scholar
8. Makary MA, Daniel M. Medical error-the third leading cause of death in the US. Br Med J 2016;353:i2139.10.1136/bmj.i2139Search in Google Scholar
©2019 Walter de Gruyter GmbH, Berlin/Boston