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Description:
Reflect on the research articles you have reviewed to date that relate to your clinical question. Please refer to all the unit resources (e.g., readings, recordings, announcements, etc.) to facilitate this process. With these thoughts in mind, post your thoughts on the following:

In the articles you have reviewed, what statistical tests are being used for data analysis?
Are the statistical tests being used appropriately for the type of data being produced and the question being asked?
Do the authors appropriately indicate implications of the data analysis, or do they overstretch?

In the articles that have I reviewed listed below, I need to know what statistical tests are being used for data analysis?
· A key study for my PICOT project is titled “How Accurate are Self-Reports? An Analysis of Self-Reported Healthcare Utilization and Absence When Compared to Administrative Data” (Koerner & Zhang, 2017).  The authors evaluated the data using Pearson’s correlation and multivariate logistic regression models.
·  Correlation is a statistical method used to assess a possible linear association between two continuous variables, while Pearson’s correlation coefficient is a test statistics measuring the statistical relationship, or association, between two continuous variables (Mahan, Clark, Anderson, Koller, & Gates, 2017).. Pearson’s correlation coefficient (r) is a measure of the strength of the association between the two variables; it is the best method of measuring the association between variables of interest because it is based on the method of covariance, and covariance is a measure of the joint variability of two random variables (Koerner et al., 2017). If the data is normally distributed, in other words, bell-shaped, and symmetrical about the mean, tests such as the histogram, and normality tests may be used to evaluate if the distribution is normal (McCrum-Gardner, 2008).
· Are the statistical tests being used appropriately for the type of data being produced and the question being asked?
· The majority of studies may be evaluated with the proper evaluation of over 100 statistical tests to choose from. Tests are chosen depending on the type of research questions being asked, the type of data being analyzed, and the number of data sets or groups being evaluated.
· The first question to be asked is what scale of measurement the data will be, nominal, ordinal, or interval. The study in question involves interval data. The second question is the reason for the analysis; as an example, paired groups or independent groups?
· Yes, the statistical tests are appropriate for the type of data being produced, and for the type of questions being asked.
· Do the authors appropriately indicate implications of the data analysis, or do they overstretch? 
· Based on our readings and videos, I saw no evidence of data-stretching. For example, data was collected over two calendar years, a lengthy, non-selective inclusion period. A potential confounding factor was that all participants had to have been enrolled in the company health insurance program a minimum of 320 days as a condition of inclusion in the study. Another potential confounding factor was that only hourly employees were included in the two-year study. In addition, pregnant employees were excluded from the study, as these employees are atypical of the general employee population in that their healthcare utilization would be temporarily altered. These factors may have influenced the results, by excluding participants with different reporting habits. After recognizing these potential limitations, their findings mirrored multiple studies previously conducted.
· The authors also noted potential improvements for future studies, including inclusion of a more diverse employee population, and examining why there exists a difference in self-reporting based on participant sex.
References
· Koerner, T. K., & Zhang, Y. (2017). Application of linear mixed-effects models in human neuroscience research: A comparison with pearson correlation in two auditory electrophysiology studies. Brain Sciences, 7(3), page 26. doi:http://dx.doi.org.prx-usa.lirn.net/10.3390/brainsci7030026
· Mahan, K.R., Clark, J.A., Anderson, K.D., Koller, N.J., & Gates, B. J. (2017). Development of a tool to identify problems related to medication adherence in home healthcare patients. Home Healthcare Now, 277-82. doi: 10.1097/nhh.0000000000000539
· McCrum-Gardner, E. (2008).  Which is the correct statistical test to use? British Journal of Oral and Maxillofacial Surgery 46 (2008) 38–41
· Short, M., Goetzel, R., Pei, X., Tabrizi, M., Ozminkowski, R., Gibson, T., & … Wilson, M. (2009). How accurate are self-reports? Analysis of self-reported health care utilization and absence when compared with administrative data. Journal of Occupational & Environmental Medicine, 51(7), 786-796. doi:10.1097/JOM.0b013e3181a86671
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Types of Statistical use
There were six articles retrieved on my PICOT question, (3) were quantitative research, (1) is a mixed method, (2) qualitative research, and (1 )integrative review. The (3) quantitative research were critically appraised and used the following statistical analysis; central standard tendency (mean, median, mode), a probability value to test the significance of results, binomial regression, and binomial distribution, chi-square test, Fisher’s exact test, and measures of standard deviation. Lastly, a study about changing Intensive Care Unit (ICU) culture to reduce CAUTI the research study used statistical process control charts to see the process of improvement in the reduction of catheter-associated infection post-implementation (Maxwell, Murphy and McGettigan, 2018).
Appropriateness of the statistical test 
The purpose or hypothesis of the study is in the introduction of each literature. The research question aims to evaluate the effectiveness of the CAUTI bundle in the pediatric intensive care unit and adult intensive care unit. To provide patient safety, the use of an appropriate statistical tool in research is essential. According to McCrum-Gardner (2007), using the right scale of measurement will convey accurate results in research.  One research study use sample size is 390 (nominal) children ages from 1 month to 18 years old and admitted in the ICU for 48 hours that needed foley catheter insertion. The exclusions are positive urine culture and less than 48 hours of ICU admission. In addition, the Categorial variable is analyzed using X2 or Fisher exact test. The prevalence rate was calculated using the number of disease within the specified time over the population under risk x 100. The research study shows Foley catheter utilization was calculated by dividing the total number of device days by the total number of patient days (Sönmez Düzkaya, Bozkurt, Uysal, and Yakut,2016). Moreover, the three quantitative research use an appropriate tool and results show that daily CAUTI BUNDLE implementation and changing ICU culture regarding the standard practice showed a significant reduction of catheter-associated urinary tract infection in pediatric ICU and adult ICU.
Conclusion
The implication of the research study indicates that prevention of CAUTI with the use of CAUTI bundle checklist and application of process improvement had a significant impact on the decreasing morbidity, mortality and healthcare cost. Also, the length of study allowed the researchers to see a significant, consistent change in the reduction of CAUTI.
References
Maxwell,M.,Murphy, K., and McGettigan, M. (2018)Changing ICU culture to reduce catheter-associated urinary tract infections. Canadian Journal of Infection Control,33 (1) ,39-43 . Retrieved from https://ipac-                   canada.org/photos/custom/pdf/Marcia%20Maxwell_Spring2018.pdf
McCrum-Gardner, E. (2007). Which is the correct statistical test to use?British Journal of Oral and Maxiofacial Surgery, 46, 38-41. Retrieved from https://class.esa.edu/bbcswebdav/institution/USA1/201830/MSN/IPE_7050/readings/McCrumGardner_Which_is the_correct_ statistical_test_to_use_pdf
Sönmez Düzkaya, D., Bozkurt, G., Uysal, G., & Yakut, T. (2016). The effects of bundles  on catheter-associated urinary tract infections in the pediatric intensive care unit.Clinical Nurse Specialist: The Journal For Advanced Nursing Practice, 30(6),341-346. doi:10.1097/NUR.0000000000000246
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