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Statistical analysis

AE Ahmed R. Eldesoky
GF Giulio Francolini
MT Mette S. Thomsen
EY Esben S. Yates
TN Tine B. Nyeng
CK Carine Kirkove
CK Claus Kamby
EB Egil S. Blix
MN Mette H. Nielsen
ZT Zahra Taheri-Kadkhoda
MB Martin Berg
BO Birgitte V. Offersen
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Stata® version 12.0 software (StataCorp., Texas, USA) was used for statistical analysis. Descriptive statistics including median, inter-quartile range (IQR) for all parameters were calculated. Shapiro–Wilk normality test showed that compared data did not follow a normal distribution. So, a Wilcoxon signed rank test was used to test the statistical significance of the difference in all parameters and a Spearman’s rank correlation test was used for correlation testing. Two sided p-values were provided and p-values <0.05 were considered significant.

Copyright and License information:  ©2017 The Authors
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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