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Joint assessment of modifiers and/confounders PowerPoint PPT Presentation

Joint assessment of modifiers and/confounders - Joint assessment of modifiers and/confounders Maybe one-at-time assessment is not enough The merits of regression analysis start to kick in! Joint effect modification ...

Joint assessment of modifiers and/confounders Maybe one-at-time assessment is not enough The merits of regression analysis start to kick in! Joint effect modification ...

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Using Regression Analysis to Assess Potential Effect Modifiers and Confounders PowerPoint PPT Presentation

Using Regression Analysis to Assess Potential Effect Modifiers and Confounders - Using Regression Analysis to Assess Potential Effect Modifiers and Confounders Y (blood pressure reduction) Question: Does the effect of the drug on Mean BPR depend ...

Using Regression Analysis to Assess Potential Effect Modifiers and Confounders Y (blood pressure reduction) Question: Does the effect of the drug on Mean BPR depend ...

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Using Regression Analysis to Assess Potential Effect Modifiers and Confounders - Title: Using Regression Analysis to Assess Potential Effect Modifiers and Confounders Author: Gordon Hilton Fick Last modified by: Gordon Hilton Fick

Title: Using Regression Analysis to Assess Potential Effect Modifiers and Confounders Author: Gordon Hilton Fick Last modified by: Gordon Hilton Fick

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Design and Analysis of Clinical Study 2. Bias and Confounders PowerPoint PPT Presentation

Design and Analysis of Clinical Study 2. Bias and Confounders - Design and Analysis of Clinical Study 2. Bias and Confounders Dr. Tuan V. Nguyen Garvan Institute of Medical Research Sydney, Australia

Design and Analysis of Clinical Study 2. Bias and Confounders Dr. Tuan V. Nguyen Garvan Institute of Medical Research Sydney, Australia

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Different Goals in Metaanalysis of Studies of a Diagnostic Test Lead to Different Answers PowerPoint PPT Presentation

Different Goals in Metaanalysis of Studies of a Diagnostic Test Lead to Different Answers - Comparison SROC and GROC curves. SROC adjusts for confounders, GROC incorporates confounders ... are different for men and women: 'Because of erythropoietic ...

Comparison SROC and GROC curves. SROC adjusts for confounders, GROC incorporates confounders ... are different for men and women: 'Because of erythropoietic ...

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Follow-up and Compliance: Outline PowerPoint PPT Presentation

Follow-up and Compliance: Outline - Most drop outs occur in early study period ... One of the main Commandments of RCT bible ... Lessons. Unknown/unmeasured confounders associated with compliance ...

Most drop outs occur in early study period ... One of the main Commandments of RCT bible ... Lessons. Unknown/unmeasured confounders associated with compliance ...

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Study designs in air pollution epidemiology PowerPoint PPT Presentation

Study designs in air pollution epidemiology - Confounders weather, pollens. Low concentrations of pollutants ... Ruth C Toneguzzi, Victoria J Westley-Wise, Trevor Dunn and Dennis Calvert ...

Confounders weather, pollens. Low concentrations of pollutants ... Ruth C Toneguzzi, Victoria J Westley-Wise, Trevor Dunn and Dennis Calvert ...

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Kriess NEJM - iatrogenic causes. lactate-buffered haemofiltration. epinephrine ... many confounders (patient/iatrogenic) Tissue PCO2. gut tonometry. sublingual capnometry ...

iatrogenic causes. lactate-buffered haemofiltration. epinephrine ... many confounders (patient/iatrogenic) Tissue PCO2. gut tonometry. sublingual capnometry ...

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Physician Asthma Care Education (PACE) PowerPoint PPT Presentation

Physician Asthma Care Education (PACE) - P A C E hysician sthma are ducation Evaluation Methods Patient Outcomes Health System Factors (non-MD) Other Confounders Parental Factors Patient Factors Environment ...

P A C E hysician sthma are ducation Evaluation Methods Patient Outcomes Health System Factors (non-MD) Other Confounders Parental Factors Patient Factors Environment ...

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Confounding - 9/15/09. Confounding. Dr. Sunita Dodani. Assistant Professor. Family Medicine, CHS ... To understand the role of confounders in a study ...

9/15/09. Confounding. Dr. Sunita Dodani. Assistant Professor. Family Medicine, CHS ... To understand the role of confounders in a study ...

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The Impact of Patient Adherence on Physician Performance Measurement PowerPoint PPT Presentation

The Impact of Patient Adherence on Physician Performance Measurement - The nature of the problem: Why do adherence and persistence ... Reliability can be ascertained. Insight into dosing intervals. Many confounders. Selection bias ...

The nature of the problem: Why do adherence and persistence ... Reliability can be ascertained. Insight into dosing intervals. Many confounders. Selection bias ...

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Using Directed Acyclic Graphs (DAGs) to assess confounding PowerPoint PPT Presentation

Using Directed Acyclic Graphs (DAGs) to assess confounding - The Issue Confounding introduces bias into effect estimates Common methods to assess confounding can Fail to identify confounders residual bias Introduce bias ...

The Issue Confounding introduces bias into effect estimates Common methods to assess confounding can Fail to identify confounders residual bias Introduce bias ...

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Meaningful differences in maternal smoking behaviour during pregnancy: Implications for infant behav PowerPoint PPT Presentation

Meaningful differences in maternal smoking behaviour during pregnancy: Implications for infant behav - (CD, ODD, co-morbid ADHD) Smoking. Substance use. Multiple, independent, cross-national samples, robust to measured confounders ...

(CD, ODD, co-morbid ADHD) Smoking. Substance use. Multiple, independent, cross-national samples, robust to measured confounders ...

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Initial Implementation of an Intelligent Patient Data Review Assistant IPDRA PowerPoint PPT Presentation

Initial Implementation of an Intelligent Patient Data Review Assistant IPDRA - ... a medical consultant integrated medical data to facilitate diagnosis or ... Do views decrease medical errors? ... Medical Confounders: 'Yes/No' 'Start Date ...

... a medical consultant integrated medical data to facilitate diagnosis or ... Do views decrease medical errors? ... Medical Confounders: 'Yes/No' 'Start Date ...

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Confounding - To understand difference between confounding and effect modification ... Study might be confounded by highly motivated volunteers that may have selected ...

To understand difference between confounding and effect modification ... Study might be confounded by highly motivated volunteers that may have selected ...

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Confounding, Effect Modification, and Stratification Yu-Fen PowerPoint PPT Presentation

Confounding, Effect Modification, and Stratification Yu-Fen - Confounding, Effect Modification, and Stratification Yu-Fen Li Adding a Third Dimension to the RxC contingency tables Mediator Confounder Effect modifier Exposure ...

Confounding, Effect Modification, and Stratification Yu-Fen Li Adding a Third Dimension to the RxC contingency tables Mediator Confounder Effect modifier Exposure ...

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Confounding, Effect Modification, and Stratification PowerPoint PPT Presentation

Confounding, Effect Modification, and Stratification - Drinker. Non-drinker. 100. 200. Lung cancer. No lung cancer. 50. 50. 50. 150. Confounding: example ... Drinker. Non-drinker. 25. 175. Lung cancer. No lung ...

Drinker. Non-drinker. 100. 200. Lung cancer. No lung cancer. 50. 50. 50. 150. Confounding: example ... Drinker. Non-drinker. 25. 175. Lung cancer. No lung ...

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Sensitivity Analysis for Residual Confounding PowerPoint PPT Presentation

Sensitivity Analysis for Residual Confounding - Sebastian Schneeweiss MD, ScD Division of Pharmacoepidemiology and Pharmacoeconomics Department of Medicine, Harvard Medical School, Outline Residual Confounding and ...

Sebastian Schneeweiss MD, ScD Division of Pharmacoepidemiology and Pharmacoeconomics Department of Medicine, Harvard Medical School, Outline Residual Confounding and ...

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Confounding, Effect Modification, and Stratification - Title: Disordered Eating, Menstrual Irregularity, and Bone Mineral Density in Young Female Runners Author: John Last modified by: Kristin Created Date

Title: Disordered Eating, Menstrual Irregularity, and Bone Mineral Density in Young Female Runners Author: John Last modified by: Kristin Created Date

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A%20short%20introduction%20to%20epidemiology%20Chapter%209a:%20Multiple%20regression PowerPoint PPT Presentation

A%20short%20introduction%20to%20epidemiology%20Chapter%209a:%20Multiple%20regression - Title: Epidemiology Author: Neil Pearce Last modified by: Information Technology Services Created Date: 4/16/1997 8:14:14 PM Document presentation format

Title: Epidemiology Author: Neil Pearce Last modified by: Information Technology Services Created Date: 4/16/1997 8:14:14 PM Document presentation format

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Sensitivity Analysis for Residual Confounding - External Adjustment. One step beyond sensitivity analyses ... Strategies to Adjust residual con-founding using external information ...

External Adjustment. One step beyond sensitivity analyses ... Strategies to Adjust residual con-founding using external information ...

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Methodological Issues in Outcome Research PowerPoint PPT Presentation

Methodological Issues in Outcome Research - To discuss state of the art analytical approaches to adjust for confounding in ... Sebastian Schneeweiss, M.D., ScD. Department of Medicine, Harvard Medical School ...

To discuss state of the art analytical approaches to adjust for confounding in ... Sebastian Schneeweiss, M.D., ScD. Department of Medicine, Harvard Medical School ...

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Bias, Confounding, PowerPoint PPT Presentation

Bias, Confounding, - Alcohol consumption and lung cancer (summary) ... Smoking is a strong risk factor for lung cancer. Smoking is associated with alcohol consumption ...

Alcohol consumption and lung cancer (summary) ... Smoking is a strong risk factor for lung cancer. Smoking is associated with alcohol consumption ...

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Confounding and effect modification PowerPoint PPT Presentation

Confounding and effect modification - After data collection! Restriction ... Salmonella after wedding dinner. Disease seems to be associated with both chicken and rice ...

After data collection! Restriction ... Salmonella after wedding dinner. Disease seems to be associated with both chicken and rice ...

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A short introduction to epidemiology Chapter 9a: Multiple regression PowerPoint PPT Presentation

A short introduction to epidemiology Chapter 9a: Multiple regression - Poisson regression is the appropriate model for cohort studies with incidence rates ... In Poisson regression the data is already grouped and the model supplies the ...

Poisson regression is the appropriate model for cohort studies with incidence rates ... In Poisson regression the data is already grouped and the model supplies the ...

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Confounding, Effect Modification, and Stratification - Cumbersome if more than a single confounder ... Among white women, stage of breast cancer at detection is associated with education. ...

Cumbersome if more than a single confounder ... Among white women, stage of breast cancer at detection is associated with education. ...

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EPB PHC 6000 EPIDEMIOLOGY FALL, 1997 PowerPoint PPT Presentation

EPB PHC 6000 EPIDEMIOLOGY FALL, 1997 - ... the exposure/disease association within homogeneous categories or strata of the ... specific estimates are similar (homogeneous), the estimates can be combined ...

... the exposure/disease association within homogeneous categories or strata of the ... specific estimates are similar (homogeneous), the estimates can be combined ...

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19: Stratified 2-by-2 Tables PowerPoint PPT Presentation

19: Stratified 2-by-2 Tables - 19.1 Confounding Confounding a distortion in an association brought ... of confounding variables Associated ... between two variables may ...

19.1 Confounding Confounding a distortion in an association brought ... of confounding variables Associated ... between two variables may ...

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Using Marginal Structural Model to Estimate and Adjust for Causal Effect of Post-discontinuation Chemotherapy on Survival in Cancer Trials PowerPoint PPT Presentation

Using Marginal Structural Model to Estimate and Adjust for Causal Effect of Post-discontinuation Chemotherapy on Survival in Cancer Trials - Survival is measured by the time from randomization to death from any cause. ... absence of unmeasured confounding and model misspecification (Robins 1997, 2000) ...

Survival is measured by the time from randomization to death from any cause. ... absence of unmeasured confounding and model misspecification (Robins 1997, 2000) ...

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Advanced Data Analysis: Methods to Control for Confounding (Matching and Logistic Regression) PowerPoint PPT Presentation

Advanced Data Analysis: Methods to Control for Confounding (Matching and Logistic Regression) - Understand the issue of confounding in statistical ... for confounding you must take the confounding variable out of the picture ... Wedding Reception, 1997 (4) ...

Understand the issue of confounding in statistical ... for confounding you must take the confounding variable out of the picture ... Wedding Reception, 1997 (4) ...

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Case-control study 3: Bias and confounding and analysis PowerPoint PPT Presentation

Case-control study 3: Bias and confounding and analysis - Select controls that are representative of source population ... 'The Norwegian comedian Marve Fleksnes once stated: I am probably allergic to ...

Select controls that are representative of source population ... 'The Norwegian comedian Marve Fleksnes once stated: I am probably allergic to ...

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Confounding in epidemiology PowerPoint PPT Presentation

Confounding in epidemiology - Title: Slide 1 Author: Maura Last modified by: Maura Created Date: 11/10/2003 1:44:16 AM Document presentation format: Presentazione su schermo (4:3)

Title: Slide 1 Author: Maura Last modified by: Maura Created Date: 11/10/2003 1:44:16 AM Document presentation format: Presentazione su schermo (4:3)

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EPID 623-88 Introduction to Analysis and Interpretation of HIV/STD Data Confounding Manya Magnus, Ph.D. Summer 2001 adapted from M. O PowerPoint PPT Presentation

EPID 623-88 Introduction to Analysis and Interpretation of HIV/STD Data Confounding Manya Magnus, Ph.D. Summer 2001 adapted from M. O - Title: EPI 722 Epidemiology of Infectious Diseases Application Author: Patty Kissinger Last modified by: manya magnus Created Date: 1/22/2001 1:50:23 AM

Title: EPI 722 Epidemiology of Infectious Diseases Application Author: Patty Kissinger Last modified by: manya magnus Created Date: 1/22/2001 1:50:23 AM

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Causal Diagrams for Epidemiological Research PowerPoint PPT Presentation

Causal Diagrams for Epidemiological Research - Causal Diagrams for Epidemiological Research Eyal Shahar, MD, MPH Professor Division of Epidemiology & Biostatistics Mel and Enid Zuckerman College of Public Health

Causal Diagrams for Epidemiological Research Eyal Shahar, MD, MPH Professor Division of Epidemiology & Biostatistics Mel and Enid Zuckerman College of Public Health

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Confounding - Occurs when disease risk factors are unevenly distributed across ... X1 Z1 causal ( causal synergism) 0. 0. 0. 1. 8. Mutual blockage (preventive antagonism) ...

Occurs when disease risk factors are unevenly distributed across ... X1 Z1 causal ( causal synergism) 0. 0. 0. 1. 8. Mutual blockage (preventive antagonism) ...

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CONFOUNDING - Cases of Down Syndrome by Birth Order. and Maternal Age ... Different effects in different strata. Simple. Useful. Increases knowledge of biological mechanism ...

Cases of Down Syndrome by Birth Order. and Maternal Age ... Different effects in different strata. Simple. Useful. Increases knowledge of biological mechanism ...

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EPB PHC 6000 EPIDEMIOLOGY FALL, 1997 - 1. Understand the 'design' and 'analysis' methods used to ... CONTROL OF CONFOUNDING. Mantel-Haenszel pooled RR estimate (uniform strata): S a(c d) / T. RRMH ...

1. Understand the 'design' and 'analysis' methods used to ... CONTROL OF CONFOUNDING. Mantel-Haenszel pooled RR estimate (uniform strata): S a(c d) / T. RRMH ...

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Our aim is to discover and ascertain the nature and substance of the soul, and, in the next place, a PowerPoint PPT Presentation

Our aim is to discover and ascertain the nature and substance of the soul, and, in the next place, a - Our aim is to discover and ascertain the nature and substance of the soul, and, ... Some ((EGRET, StatXact) can provide exact homogeneity p-value if numbers not too ...

Our aim is to discover and ascertain the nature and substance of the soul, and, ... Some ((EGRET, StatXact) can provide exact homogeneity p-value if numbers not too ...

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Effect Modification PowerPoint PPT Presentation

Effect Modification - Title: No Slide Title Author: Janal Informatique Last modified by: User Created Date: 10/8/1999 5:02:43 PM Document presentation format: ...

Title: No Slide Title Author: Janal Informatique Last modified by: User Created Date: 10/8/1999 5:02:43 PM Document presentation format: ...

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Confounding and Interaction: Part II PowerPoint PPT Presentation

Confounding and Interaction: Part II - ... from last week you all remember ... Third,the decisions you ... that the heyday for matching was clearly in the past before the advent of newer mathematical ...

... from last week you all remember ... Third,the decisions you ... that the heyday for matching was clearly in the past before the advent of newer mathematical ...

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Followup and confounding followup study theme 23052006 PowerPoint PPT Presentation

Followup and confounding followup study theme 23052006 - The mediating variable should not be in the analysis as we are interested in the ... diabetic patients and their relation to glycaemia, lood pressure and weight. ...

The mediating variable should not be in the analysis as we are interested in the ... diabetic patients and their relation to glycaemia, lood pressure and weight. ...

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THREE CONCEPTS ABOUT THE RELATIONSHIPS OF VARIABLES IN RESEARCH PowerPoint PPT Presentation

THREE CONCEPTS ABOUT THE RELATIONSHIPS OF VARIABLES IN RESEARCH - three concepts about the relationships of variables in research confounding mediation effect modification, interaction or moderation thinking about the ways in which ...

three concepts about the relationships of variables in research confounding mediation effect modification, interaction or moderation thinking about the ways in which ...

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Threats to the Validity of Hypothesis Testing: Confounding PowerPoint PPT Presentation

Threats to the Validity of Hypothesis Testing: Confounding - Define 'unbalanced confounding variables' and explain how they threaten the ... a newly discovered form of brain neoplasm, has a 75% response rate when treated ...

Define 'unbalanced confounding variables' and explain how they threaten the ... a newly discovered form of brain neoplasm, has a 75% response rate when treated ...

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Confounding - Diet/lifestyle. Vitamin C. Cancer. Non-causal. Causal. People who take vitamin C may. eat a healthier diet and live a. healthier lifestyle. Confounding. Design ...

Diet/lifestyle. Vitamin C. Cancer. Non-causal. Causal. People who take vitamin C may. eat a healthier diet and live a. healthier lifestyle. Confounding. Design ...

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Casecontrol study PowerPoint PPT Presentation

Casecontrol study - E.g. liver cancer and unfresh peanut consumption. Exposure recall may be affected by the disease status ... bias and recall bias. Confounding factors ...

E.g. liver cancer and unfresh peanut consumption. Exposure recall may be affected by the disease status ... bias and recall bias. Confounding factors ...

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C - Title: No Slide Title Author: John M. Colford, Jr. Last modified by: Jeff Martin Created Date: 6/17/1995 11:31:02 PM Document presentation format

Title: No Slide Title Author: John M. Colford, Jr. Last modified by: Jeff Martin Created Date: 6/17/1995 11:31:02 PM Document presentation format

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Correcting for exposure and confounder measurement error in metaanalysis of epidemiological studies PowerPoint PPT Presentation

Correcting for exposure and confounder measurement error in metaanalysis of epidemiological studies - Angela Wood1, Ian White2, Simon Thompson2, John Danesh1 ... Finding: allowing for such uncertainty had very little effect on the adjusted hazard ratios CIs. ...

Angela Wood1, Ian White2, Simon Thompson2, John Danesh1 ... Finding: allowing for such uncertainty had very little effect on the adjusted hazard ratios CIs. ...

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Poisson Regression PowerPoint PPT Presentation

Poisson Regression - To be able to detect the presence of potentially important confounding and/or ... Colony counts with varying experimental conditions ...

To be able to detect the presence of potentially important confounding and/or ... Colony counts with varying experimental conditions ...

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THREE CONCEPTS ABOUT THE RELATIONSHIPS OF VARIABLES IN RESEARCH - Smoking fulfills one criterion for potential confounding. ... Adjustment for cigarette smoking eliminates the association of heavy coffee ...

Smoking fulfills one criterion for potential confounding. ... Adjustment for cigarette smoking eliminates the association of heavy coffee ...

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Article Review PowerPoint PPT Presentation

Article Review - Article Review Cara Carty 09-Mar-06 Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza ...

Article Review Cara Carty 09-Mar-06 Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza ...

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THREE CONCEPTS ABOUT THE RELATIONSHIPS OF VARIABLES IN RESEARCH - Thus while an exposure may cause a disease, another way in ... Heavy coffee drinking is statistically associated with higher rates of myocardial infarction. ...

Thus while an exposure may cause a disease, another way in ... Heavy coffee drinking is statistically associated with higher rates of myocardial infarction. ...

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Should you get rid of the nightlight in your child PowerPoint PPT Presentation

Should you get rid of the nightlight in your child - Quinn et al. 1999 Does the use of nightlights in children cause them to have myopia (nearsightedness)? Prevalence ratio = Should you get rid of the nightlight in your ...

Quinn et al. 1999 Does the use of nightlights in children cause them to have myopia (nearsightedness)? Prevalence ratio = Should you get rid of the nightlight in your ...

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Associations between periodontitis and CHDstroke how strong is the evidence PowerPoint PPT Presentation

Associations between periodontitis and CHDstroke how strong is the evidence - Boston University School of Dental Medicine 'old news' 1997. Associated Press, July 9, 1997 ... composite primary endpoint (fatal MI, revascularization, unstable AP) ...

Boston University School of Dental Medicine 'old news' 1997. Associated Press, July 9, 1997 ... composite primary endpoint (fatal MI, revascularization, unstable AP) ...

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Randomization and Comparative Designs PowerPoint PPT Presentation

Randomization and Comparative Designs - Is it so strange to imagine that the sicker patients would tend to have shorter survival? Now that they have 'confounded' sick status with treatment, they CANNOT ...

Is it so strange to imagine that the sicker patients would tend to have shorter survival? Now that they have 'confounded' sick status with treatment, they CANNOT ...

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Confounding and Interaction: Part II - e.g. case-control study: non-diseased controls are 'matched' to diseased cases ... In general, matching decreases robustness of study to address secondary questions. ...

e.g. case-control study: non-diseased controls are 'matched' to diseased cases ... In general, matching decreases robustness of study to address secondary questions. ...

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Uncontrolled and induced confounding: lessons from simulations PowerPoint PPT Presentation

Uncontrolled and induced confounding: lessons from simulations - bias increases with var(Mat CRP) bias decreases with var(Mat SBP) 18. A special example: ... Maternal CRP (mg/L) Instrumental variables ...

bias increases with var(Mat CRP) bias decreases with var(Mat SBP) 18. A special example: ... Maternal CRP (mg/L) Instrumental variables ...

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Confounders PowerPoint PPT Presentations