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. 2020 Nov 20;73(6):503–508. doi: 10.4097/kja.20137

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Copyright © The Korean Society of Anesthesiologists, 2020

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.

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Fig. 1. — Quartile-Quartile plot (Q-Q plot) of original data and logarithmically transformed data. (A) Q-Q plot of original data. Upper tail of the plot seems to be going off from the straight line. This means that data has a probability of non-normal distribution. Mean and SD of this data is 20.52 and 4.117. The skewness of this distribution is 0.56, and it is a positively skewed distribution. Shapiro-Wilk normality test statistics = 0.974, P = 0.047. (B) Q-Q plot of natural logarithmic transformed data. Non-normality of data distribution seems to be improved in the part of the upper tail. Mean and SD of transformed data is 3.0 and 0.201. Skewness of transformed data is -0.14, Shapiro-Wilk normality test statistics = 0.988, P = 0.477.