Tips for troublesome sample-size calculation

Junyong In; Hyun Kang; Jong Hae Kim; Tae Kyun Kim; Eun Jin Ahn; Dong Kyu Lee; Sangseok Lee; Jae Hong Park

doi:10.4097/kja.19497.e1

Corrigendum

Korean J Anesthesiol 2020;73(3):268-268.

Published online: 25 May 2020

DOI: https://doi.org/10.4097/kja.19497.e1

Tips for troublesome sample-size calculation

Junyong In¹, Hyun Kang², Jong Hae Kim³, Tae Kyun Kim⁴, Eun Jin Ahn⁵, Dong Kyu Lee⁶, Sangseok Lee⁷, Jae Hong Park⁸

¹Department of Anesthesiology and Pain Medicine, Dongguk University Ilsan Hospital, Goyang, Korea

²Department of Anesthesiology and Pain Medicine, Chung-Ang University College of Medicine, Seoul, Korea

³Department of Anesthesiology and Pain Medicine, Daegu Catholic University School of Medicine, Daegu, Korea

⁴Department of Anesthesiology and Pain Medicine, Yangsan Hospital, Pusan National University School of Medicine, Busan, Korea

⁵Department of Anesthesiology and Pain Medicine, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea

⁶Department of Anesthesiology and Pain Medicine, Guro Hospital, Korea University School of Medicine, Seoul, Korea

⁷Department of Anesthesiology and Pain Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea

⁸Department of Anesthesiology and Pain Medicine, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Korean Journal of Anesthesiology 2020; 73(2):114-120

https://doi.org/10.4097/kja.19497

The article by In J, et al. entitled, “Tips for troublesome sample-size calculation.” contained an error in the Equation 12.

Before correction:

(12)

Adjusted sample size = \frac{C a l c u l a t e d s a m p l e s i z e}{1 - d r o p o u t r a t e} = \frac{39}{1 - 0.9} = 43.33

The correct information is found below:

(12)

Adjusted sample size = \frac{C a l c u l a t e d s a m p l e s i z e}{1 - d r o p o u t r a t e} = \frac{39}{1 - 0.1} = 43.33

The value for dropout rate was incorrectly printed as 0.9. The value for dropout rate should be corrected to 0.1.

The authors apologize for any inconvenience this mistake may have caused.