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The method and the methodologyMethod justification:The initial methodology of this study was a mixed method design for data collection. Mixed method is used to combine qualitative and quantitative data in order to maximise the strengths of each, thus, helps to answer questions that are difficult to be answered by one approach (Ozawa & Pongpirul, 2013). Mixed method design helps to view the topic from multiple perspectives in order to develop a complete understanding, to reduce intrinsicbias which comes from single method and to triangulate findings. On theother hand, mixed method creates more data, which means more analyses, high cost and more efforts (Johnson et al, 2007). The proposed qualitative data was a form of interview with the HODs of the participating departments (radiology, urology, emergency), whereas quantitative data is a numerical data of patients details which needed for the study as well as imaging procedures details. Face to face interview was proposed with the consultant urologist in order to obtain their opinions with regards to the diagnosis and treatment pathway of acute renal colic patients. Unfortunately, the methodology has been changed from a mixed method to a retrospective quantitative study due to the short timeframe, this was due to the long timetaken in obtaining the ethical approval from my home country, which took more than twomonths and addition to some management issues in the radiology department to get thepermission letter in order to get access to the radiology information system.1
Ethical Consideration: Ethical approval was attained from the Research and Ethical Review & Approve committee- North Batinah Governorate (RERAC-NBG) and permission letter for RIS access was obtained from the head of radiology department. Patient`s consent is not needed in my trust for retrospective studies of cases series.Details of Sampling Method:This study design is a quantitative retrospective observational (non-experimental) cross sectional cohort study design. Quantitative research is one of the best designs to show the degree of effectiveness of a diagnostic test in the health care. The data collection in qualitative study has some criteria such as: it is structured, standardized and predetermined. Moreover, the sampling approaches is purposive targeting a particular group of people and in this study the purposive sample is CT KUB patients (Singh, 2007). Furthermore, one of the best advantages of observational approaches is that examining the sample without any direct modification or control. In addition, there are many other advantages of observational approaches for example: it can study natural situation, can be both respective and retrospective and it is relatively cheap approaches. On the other hand, observational approaches have some disadvantages which include: external variables are difficult to be controlled, lack of standardization, hard to repeat or replicate and data can be more liable for bias. As this study is cohort design, so the sample size is expected to be large, because cohort study design is usually of a high sample size which is indirect advantage to minimize the bias which 2
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