VOLUME 38 | ISSUE 6 | NOVEMBER-DECEMBER 2018

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RE: Perceptions of confidence among Saudi nursing interns during internship program: a cross-sectional study The use of nonparametric statistical tests

Mustafa Afifi

From the College of  Health Sciences, Jumeira University, Dubai, United Arab Emirates

How to cite this article:

Afifi M. RE: Perceptions of confidence among Saudi nursing interns during internship program: a cross-sectional study: The use of nonparametric statistical tests. Ann Saudi Med 2019; 38(6): 453 DOI: 10.5144/0256-4947.2018.453


To The Editor: I have read with care the paper of Aboshaiqah et at. entitled “Perceptions of confidence among Saudi nursing interns during internship program: a cross-section.al study”.1 I acknowledge the output of the authors, but found statistical errors which I would kindly like to bring to their notice. 


Despite that the indicators in their research showed evidence of normal distribution of their data and linearity of variables, the authors used nonparametric statistical tests (Mann Whitney U test and Spearman Rank correlation). Actually, their sample size is big enough (n=301 interns). Also, the mean value of the overall perceived confidence score equals the me.dian and has a standard deviation (SD) less than one third of this mean (both the mean and median=3.7, SD 0.9). Additionally, the mean value of the overall perceived impotence score almost equals the median and has a SD less than one third of the mean (the mean=4.1, SD 0.9, median=4.4). The median should appear as a integer and not as a decimal. There are two variables in Table 5 which were not used in Table 4


Besides, the figures of perceived confidence and impotence were presented in the abstract in mean values and the authors wrote only the P of significance for Spearmen correlation and only for the confidence part of the SECS. I think the authors should clarify in their methods why they used the nonparametric statistics especially when para.metric tests are more robust in this case. 

 

Kitchen stated in her paper that the assumptions for non-parametric tests are weaker than those of parametric and researchers are better only resort to the first if normality of data was not met or the underlying distributions are heavily tailed or extremely skewed and/or the sample size is small (n<25).



Mustafa Afifi 


From the College of  Health Sciences, Jumeira University, Dubai, United Arab Emirates 


Correspondence: Dr. Mustafa Afifi College of Health Sciences, Jumeira University, Al Qouz 4, Dubai, United Arab Emirates afifidr@gmail.com ORCID: http:// orcid.org/0000-0002-9561-8318

Citation: Afifi M, RE: Perceptions of confi.dence among Saudi nursing interns dur.ing internship program: a cross-sectional study: The use of nonparametric statistical tests. Ann Saudi Med 2019; 38(6): 451 DOI: 10.5144/0256-4947.2018.451

Received: October 3, 2018

Accepted: November 13, 2018

Published: December 6, 2018

Copyright: Copyright © 2018, Annals of Saudi Medicine, Saudi Arabia. This is an open access article under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND). The details of which can be accessed at http://creative-commons. org/licenses/by-nc-nd/4.0/

Funding: None. 


 

References


1. Ahmad E. Aboshaiqah, Regie B. Tumala, Joel G. Patalagsa, Ahmed A. Al-Khaibary, Haya Al Fozan, John Paul Ben T. Silang. PerCeptions of confidence among Saudi nursing interns during internship program: a cross-sectional study. Ann Saudi Med. 2018 Jul-Aug; 38(4): 288–298. 

2. Kitchen, Christina M. R. Nonparametric versus parametric tests of location in biomedical research. Am J Ophthalmol. 2009 Apr; 147(4): 571–572. 

 

 

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