Bias (Epidemiology)
Research News and Information

Saturday, November 21, 2009

Risk of bias versus quality assessment of randomised controlled trials: cross sectional study.

17 Oct 2009 OBJECTIVES: To evaluate the risk of bias tool, introduced by the Cochrane Collaboration for assessing the internal validity of randomised trials, for inter-rater agreement, concurrent validity compared with the Jadad scale and Schulz approach to ... Read more...

Discovery properties of genome-wide association signals from cumulatively combined data sets.

4 Oct 2009 Genetic effects for common variants affecting complex disease risk are subtle. Single genome-wide association (GWA) studies are typically underpowered to detect these effects, and combination of several GWA data sets is needed to enhance discovery. ... Read more...

Baseline characteristics and statistical power in randomized controlled trials: selection, prognostic targeting, or covariate adjustment?

29 Sep 2009 OBJECTIVE: Heterogeneity of patients is a common problem in randomized controlled trials (RCTs) in various fields of clinical research. We aimed to investigate the potential benefits of different approaches for dealing with heterogeneity in a case ... Read more...

Latest indexed articles for 'Bias (Epidemiology)'

These are the very latest articles for this heading:

• Risk of bias versus quality assessment of randomised controlled trials: cross sectional study. 17 Oct 2009
• Etomidate versus ketamine for sedation in acutely ill patients. 8 Oct 2009
• Bias in identifying and recruiting participants in cluster randomised trials: what can be done? 7 Oct 2009
• Discovery properties of genome-wide association signals from cumulatively combined data sets. 4 Oct 2009
• Baseline characteristics and statistical power in randomized controlled trials: selection, prognostic targeting, or covariate adjustment? 29 Sep 2009
• Pulmonary artery catheter redux: physical findings in acute respiratory distress syndrome/acute lung injury. 29 Sep 2009
• Ventilator-associated pneumonia and mortality: the controversy continues. 29 Sep 2009
• Increasing power in randomized controlled trials. 29 Sep 2009
• The age at which cancer occurs-an overlooked parameter! 29 Sep 2009
• Systematic review of tumour number and outcome after radical treatment of colorectal liver metastases. 29 Sep 2009
• Women and children first-or last? The New York Declaration. 29 Sep 2009
• Importance of autoinfection to the epidemiology of polycyclic foliar disease. 29 Sep 2009
• Challenges in evaluating surgical innovation. 24 Sep 2009
• [Homeopathy observation study. "Criticism yes--libel no"!] 22 Sep 2009
• Questions remain over validity of EUROCARE data. 17 Sep 2009
• Impact of genotype misclassification on genetic association estimates and the bayesian adjustment. 14 Sep 2009
• Decisions in changing conditions: the urgency-gating model. 14 Sep 2009
• Re: "Determinants of quality of interview and impact on risk estimates in a case-control study of bladder cancer". 13 Sep 2009
• Invited Commentary: Causal diagrams and measurement bias. 13 Sep 2009
• The association of body mass index with health outcomes: causal, inconsistent, or confounded? 13 Sep 2009

See a longer list of these articles.

Technical information about 'Bias (Epidemiology)'

Definition: Any deviation of results or inferences from the truth, or processes leading to such deviation. Bias can result from several sources: one-sided or systematic variations in measurement from the true value (systematic error); flaws in study design; deviation of inferences, interpretations, or analyses based on flawed data or data collection; etc. There is no sense of prejudice or subjectivity implied in the assessment of bias under these conditions.

Descriptor UI: D015982

Alternative terms: Bias (Epidemiology); Biases, Epidemiologic; Epidemiologic Biases; Bias, Epidemiologic; Biases; Bias; Truncation Biases; Biases, Truncation; Truncation Bias; Bias, Truncation; Ecological Bias; Ecological Biases; Bias, Ecological; Fallacy, Ecological; Ecological Fallacies; Ecological Fallacy; Fallacies, Ecological; Biases, Ecological; Outcome Measurement Errors; Error, Outcome Measurement; Errors, Outcome Measurement; Outcome Measurement Error; Systematic Bias; Bias, Systematic; Bias, Aggregation; Aggregation Bias; Biases, Statistical; Statistical Biases; Bias, Statistical; Statistical Bias;

Tree Number: N05.715.350.150; N06.850.490.500;

Online Note: use RESEARCH to search BIAS (EPIDEMIOLOGY) 1987-89

History Note: 90; was BIAS see RESEARCH 1987-89

Technical Notes: do not use for "bias" as prejudice or subjectivity ( = PREJUDICE); IM GEN only; coord NIM with disease /epidemiol (IM), not /etiol; specify geog if pertinent; DF: BIAS