Videos uploaded by user “Terry Shaneyfelt”

This video wil help students and clinicians understand how to interpret hazard ratios.

Views: 140625
Terry Shaneyfelt

This video will discuss how to interpret the information contained in a typical forest plot.

Views: 159362
Terry Shaneyfelt

odds ratios are the measure of association in a case control study. This video demonstrates the calculation of the OR

Views: 246772
Terry Shaneyfelt

Video describing how relative risk is calculated from a cohort study. RR is just a ratio of incidence of the outcome in the exposed divided by the incidence of the outcome in the unexposed. It is also used in therapy studies.

Views: 136916
Terry Shaneyfelt

Intention to treat analysis is explained and its utility is demonstrated in this video

Views: 27647
Terry Shaneyfelt

Bradford Hill develops several criteria that you shold consider as you try to determine if an association seen in a study is causal or not

Views: 25575
Terry Shaneyfelt

The NNT is the number of patients you need to treat with the experimental therapy to prevent one additional bad outcome. This video will demonstrate how to calculate NNT

Views: 40432
Terry Shaneyfelt

RR and OR are commonly used measures of association in observational studies. In this video I will discuss how to interpret them and how to apply them to patient care

Views: 201960
Terry Shaneyfelt

Video providing an overview of how power is determined and how it relates to sample size.

Views: 43470
Terry Shaneyfelt

Video describing how to calculate the probability that a patient has disease when they have a positive test

Views: 30584
Terry Shaneyfelt

Overview of cohort study design and their strengths and limitations.

Views: 65313
Terry Shaneyfelt

Systematic reviewers have to decide whather or not studies are homogeneous enough to combine. This video will describe what heterogeneity is and some of the tests used to investigate it.

Views: 77773
Terry Shaneyfelt

In this video I describe what effect modification is and describe 2 methods to differentiate an effect modifier from a confounder.

Views: 27602
Terry Shaneyfelt

2 main types of statistical models are used to combine studies in a meta-analysis. This video will give a very basic overview of the principles behind fixed and random effects models.

Views: 59027
Terry Shaneyfelt

Length time bias is one of the biases you need to watch out for when you read a screening study. This video will describe what length time bias is.

Views: 11855
Terry Shaneyfelt

Video demonstrating how to calculate a positive likelihood ratio

Views: 23504
Terry Shaneyfelt

Traditionally prevention is divided into primary, secondary and tertiary. This video will discuss what each of these is.

Views: 27272
Terry Shaneyfelt

Part 1 of a 2 part series on how to critically appraise systematic reviews

Views: 53723
Terry Shaneyfelt

Very general overview of what publication bias is and the use of funnel plots to detect it

Views: 25117
Terry Shaneyfelt

Lead time bias is one of 3 main biases you should always think about when you read a screening study. In this video I will describe lead time bias and how you can detect it.

Views: 13500
Terry Shaneyfelt

This video will describe the imporrtance of concealed allocation in a randomized controlled trial. Concealed allocation will be differentiated from blinding.

Views: 6239
Terry Shaneyfelt

Video describing the role and interpretation of confidence intervals

Views: 36541
Terry Shaneyfelt

video describing how to calculate the specificity of a test from a diagnostic test study

Views: 18492
Terry Shaneyfelt

Part 2 of how to critically read a systematic review

Views: 27582
Terry Shaneyfelt

Video describing the role of likelihood ratios in diagnostic testing

Views: 50469
Terry Shaneyfelt

Video describing how to calculate the probability a patient doesnt have disease when they have a negative test

Views: 16610
Terry Shaneyfelt

Case-control studies are observational studies that have the greatest risk of bias. I will describe the basic design of case-control studies and discuss their strengths and weaknesses.

Views: 31017
Terry Shaneyfelt

First of a 2 part series on questions you should ask as you critically appraise a therapy study

Views: 13668
Terry Shaneyfelt

This video gives a general overview of what propensity scores are and how they are most commonly used in observational studies

Views: 10198
Terry Shaneyfelt

video describing the calculation of a negative likelihood ratio

Views: 10449
Terry Shaneyfelt

What does a p-value mean and what cant it tell you. That will be the focus of this video.

Views: 32460
Terry Shaneyfelt

Video describing how to calculate sensitivity from numbers given in a diagnostic test study

Views: 42496
Terry Shaneyfelt

This video demonstrates 2 methods to calculate the commonly used measure to report outcomes in RCTs

Views: 28787
Terry Shaneyfelt

Video describing my approach to reading a paper

Views: 6365
Terry Shaneyfelt

This tutorial discusses background and foreground quesitons and how to convert a clinical scenario in to a PICO foreground question

Views: 18404
Terry Shaneyfelt

Very basic overview of the different types of regression analysis and why regression analysis is needed. This is not for statisticians but for medical students, residents and clinicians wanting a very basic overview of what regression analysis is.

Views: 10049
Terry Shaneyfelt

Relying on RRR alone in making clinical decision can be misleading. I will outline why in this video.

Views: 5056
Terry Shaneyfelt

Residual confounding is imcompletely controlled confounding. I'll discuss how it happens and how you can detect it in this video

Views: 3298
Terry Shaneyfelt

Confounders can be controlled during the design phase and the analysis phase of a study. This video will discuss several methods available to control confounding during the design phase.

Views: 5537
Terry Shaneyfelt

I will review elements of the history and physical exam that should be focused on in the preoperative cardiac assessment. I will also discuss the role of the preoperative ECG.

Views: 4217
Terry Shaneyfelt

Video describing what clinical prediction rules are, how they are developed and how they should be used

Views: 4591
Terry Shaneyfelt

This video describes what guidelines are and reviews some of the Institute of Medicine's attributes of trustworthy guidelines

Views: 11349
Terry Shaneyfelt

In this introductory video I describe what a subgroup analysis is and discuss in very general terms some of the problems they are fraught with. This is the first in a series of 4 videos about subgroup analysis.

Views: 4713
Terry Shaneyfelt

In this video I describe how to analyze the pattern of your missing data (monotone or arbitrary) and how to use common methods to deal with missing data.

Views: 6272
Terry Shaneyfelt

In this video i will compare and contrast narrative and systematic reviews.

Views: 4444
Terry Shaneyfelt

Overview of study designs used to glean prognostic information.

Views: 4386
Terry Shaneyfelt

Studies are combined in a meta-analysis using a common summary outcome measure. In this video I will review the commonly used summary outcome measures.

Views: 6451
Terry Shaneyfelt

Video describing accuracy, precision, and the Kappa statistic

Views: 3107
Terry Shaneyfelt

In this video I review perioperative glycemia managment strategies of insulin requiring patients with diabetes.

Views: 3632
Terry Shaneyfelt

Video describing the 3 elements that diagnositc test studies must meet to ensure the validity of the estimate of the sensitivity and specificity of the diagnostic test

Views: 14887
Terry Shaneyfelt

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