Application of Statistical Methods in Bariatric Surgery

2018 ◽  
Author(s):  
Michał Robert Janik
Keyword(s):  
Bariatric Surgery ◽  
Statistical Methods ◽  
Clinical Studies ◽  
Surgical Complications ◽  
Clinical Epidemiology ◽  
Statistical Tests ◽  
Surgical Research ◽  
Surgical Practice ◽  
Know How ◽  
Different Types

It is very important to learn from surgical complications. For this reason, research is vital in surgical practice. Clinical epidemiology and statistics provide the methodology for analyzing data and drawing conclusions. Thus, every surgeon should understand the basics of clinical epidemiology in order to know how to improve his or her practice. This chapter provides a background in epidemiology and the basic statistical methods that are commonly use in bariatric surgical research. A thorough knowledge of the different types of clinical studies and commonly used statistical tests is imperative for the clinician to have in order to interpret data accurately. If necessary the help of a biostatistician will ensure appropriate statistical tests are applied and results and conclusions of studies are credible.

Pregnancy outcomes following different types of bariatric surgery: A national cohort study

2021 ◽  
Vol 260 ◽  
pp. 10-17
Author(s):  
Katie Cornthwaite ◽  
Chetan Prajapati ◽  
Erik Lenguerrand ◽  
Marian Knight ◽  
Natalie Blencowe ◽  
...  
Keyword(s):  
Bariatric Surgery ◽  
Cohort Study ◽  
Pregnancy Outcomes ◽  
Different Types ◽  
National Cohort

The Limits of Observation for Understanding Mass Violence

2015 ◽  
Vol 30 (02) ◽  
pp. 237-257 ◽  
Author(s):  
Megan Price ◽  
Patrick Ball
Keyword(s):  
Empirical Evidence ◽  
Statistical Methods ◽  
Transitional Justice ◽  
Historical Memory ◽  
Legal Responsibility ◽  
Mass Violence ◽  
Different Types ◽  
Observable Data ◽  
Quantitative Analyses

Abstract Quantitative analyses have the potential to contribute to transitional justice mechanisms, via empirical evidence supporting the memory of victims, allocating proportional responsibility among perpetrators, determining legal responsibility, and supporting historical memory and clarity. However, most data available in transitional justice settings are incomplete. Conducting quantitative analyses relying solely on what is observable and knowable leads to not only incomplete but often incorrect analytical results. This can harm rather than contribute to transitional justice mechanisms. This article outlines different types of data, the ways in which observable data, on their own, are insufficient for most quantitative analyses of interest, presents these limitations via a case study from Syria, and introduces statistical methods to overcome these limitations.

scholarly journals What you need to know about scoping reviews

Medwave ◽  
2021 ◽  
Vol 21 (02) ◽  
pp. e8144-e8144
Author(s):  
Catalina Verdejo ◽  
Luis Tapia-Benavente ◽  
Bastián Schuller-Martínez ◽  
Laura Vergara-Merino ◽  
Manuel Vargas-Peirano ◽  
...  
Keyword(s):  
Systematic Reviews ◽  
Scoping Review ◽  
Clinical Epidemiology ◽  
Recent Model ◽  
Reporting Guideline ◽  
Scoping Reviews ◽  
Literature Reviews ◽  
Different Types ◽  
Reproducible Method ◽  
Meta Analyses

The increasing amount of evidence has caused an increasing amount of literature reviews. There are different types of reviews —systematic reviews are the best known—, and every type of review has different purposes. The scoping review is a recent model that aims to answer broad questions and identify and expose the available evidence for a broader question, using a rigorous and reproducible method. In the last two decades, researchers have discussed the most appropriate method to carry out scoping reviews, and recently the “Preferred Reporting Items for Systematic Reviews and Meta-Analyses’ for scoping reviews (PRISMA-ScR) reporting guideline was published. This is the fifth article of a methodological collaborative series of narrative reviews about general topics on biostatistics and clinical epidemiology. This review aims to describe what scoping reviews are, identify their objectives, differentiate them from other types of reviews, and provide considerations on how to carry them out.

STATISTICAL ANALYSIS OF THE DAY OF THE WEEK EFFECT ON BIRTHS IN HARRIS COUNTY, TEXAS

2013 ◽  
Vol 21 (02) ◽  
pp. 1350014
Author(s):  
YI CAI ◽  
DEJIAN LAI ◽  
DOROTHY KIM WALLER ◽  
XIANGLIN DU ◽  
KEITH BURAU ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Statistical Methods ◽  
Statistical Tests ◽  
Empirical Studies ◽  
Pairwise Comparisons ◽  
Harris County ◽  
Friedman's Test ◽  
Formal Statistical Analysis ◽  
Timing Of Births ◽  
Day Of The Week

The frequency of births by day of the week has been reported by several studies without a formal statistical analysis. Births occurring on weekends have been consistently found to be less frequent than births on weekdays. In this study, we compared different statistical methods to assess the effect of the day of the week on the timing of births. We employed two statistical methods, two-way ANOVA and two-way Friedman's test, to analyze the daily variations of 222,735 births from 2005 to 2007 in Harris County, Texas. Both of the statistical tests indicated that births were not uniformly distributed by day of the week. Pairwise comparisons demonstrated that the births occurring on weekends were significantly less frequent than births occurring on weekdays. Our study together with other empirical studies would provide useful information for improving hospital management and the health of infants and their mothers.

Understanding teaching needs development

2015 ◽  
Vol 38 ◽  
Author(s):  
Sarah R. Beck
Keyword(s):  
Know How ◽  
Teaching Behaviour ◽  
Different Types

AbstractTo fully understand teaching, we need to know how it develops ontogenetically. Developmental questions about the emergence of different types of teaching behaviour in young humans and the psychological capabilities that underpin them are currently overlooked. Incorporating the individual's development from learner to teacher would expand the scope and impact of Kline's useful framework.

Effects of some Amino-acid and Purine Antagonists on Chick Embryos

Development ◽  
1958 ◽  
Vol 6 (2) ◽  
pp. 365-372
Author(s):  
C. H. Waddington ◽  
Margaret Perry
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Effective Concentration ◽  
Metabolic Inhibitors ◽  
Chick Embryos ◽  
Purine Analogue ◽  
Know How ◽  
Naturally Occurring ◽  
Different Types ◽  
Strong Action

Several authors have studied the effects on developing embryos of substances which are analogues of naturally occurring amino-acids and purines, and known to act, in other systems, as metabolic inhibitors. It was emphasized by Waddington, Feldman, & Perry (1955) that any particular substance may exhibit very different effects in embryos of different types. They found, for instance, that the purine analogue 8-azaguanine has a very strong action in the chick and a much lesser one in the newt embryo. It is therefore necessary to consider the various classes of embryos separately. In this communication we shall be concerned only with chick embryos. Substances under test can be administered to such embryos by injection through the shell, as was done in the paper cited above With this technique it is impossible to know how much diffusion takes place of the substance injected, and one cannot therefore be certain of the effective concentration which actually reaches the embryo.

Detection and Conditioning of EMG

2018 ◽  
pp. 961-1000
Author(s):  
İmran Göker
Keyword(s):  
Electrical Activity ◽  
Clinical Studies ◽  
Skeletal Muscles ◽  
Clinical Importance ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Emg Signal ◽  
Different Types ◽  
Main Components

In this chapter, the monitoring of the electrical activity of skeletal muscles is depicted. The main components of the detection and conditioning of the EMG signals is explained in the sense of the biomedical instrumentation. But, first, a brief description of EMG generation is introduced. The hardware components of the general instrumentation system used in the acquisition of EMG signal such as amplifier, filters, analog-to-digital converter are discussed in detail. Subsequently, different types of electrodes used in different EMG techniques are mentioned. Then, various EMG signals that can be detected and monitored via EMG systems are described and their clinical importance is discussed with detail. Finally, different EMG techniques used in clinical studies and their purposes are explained with detail.

Very basic R syntax.

2021 ◽  
pp. 9-12
Author(s):  
Donald L. J. Quicke ◽  
Buntika A. Butcher ◽  
Rachel A. Kruft Welton
Keyword(s):  
Programming Language ◽  
Statistical Tests ◽  
Graphical Output ◽  
Know How ◽  
R Functions

Abstract R is a programming language that has a huge range of inbuilt statistical and graphical functions. Firstly, this chapter shows how R works by talking you through a number of exercises, often producing graphical output, so you will get to know how to write simple code and become familiar with some of the most commonly used R functions for manipulating data and doing simple calculations. For ease, the chapter will firstly use a non-biological type of example. Thereafter, it will enter, display and analyse a number of real biological or medical datasets as might be obtained in student class experiments or fieldwork projects. Further on, it will present an outline of statistical tests appropriate to various types of data that you will come across.

Factors implicated in surgical complications and baros index after bariatric surgery

2003 ◽  
Vol 22 ◽  
pp. S23
Author(s):  
J.C. Desport ◽  
O. Marmottant ◽  
M. Sodji ◽  
P.M. Preux ◽  
B. Descottes
Keyword(s):  
Bariatric Surgery ◽  
Surgical Complications
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